Intellectual Property Expert Witnesses

Business, Financial & Marketing Expert Witness Listings

On this page you will find expert witnesses who may give expert opinions regarding intellectual property (IP). The professionals found through this page may advise regarding infringement and service marks. These experts may provide reports regarding authors, inventors, and IP holders. Experts found through this page may also testify regarding trade secrets, proprietary knowledge, confidential information, patents, software copyrights, and royalties, as well as related topics.

You may limit your search for Intellectual Property expert witnesses to a specific area by selecting a state from the drop down box.

Expert Witnesses

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Featured Experts
JULES H KAMIN (ValuEconomics, Inc.)
Dr. Jules Kamin received his Ph.D. in business economics, finance and management science from the University of Chicago Graduate School of Business, rated #1. He is an expert on economic damages. He brings to the practice of forensic economics a unique... Learn More ›

Ivan Zatkovich (eCompCONSULTANTS)
Internet, telecommunications & information technology specialists for intellectual property consulting and patent litigation including web commerce technologies, web marketing disputes, internet copyright, software contract disputes, e-discovery and network... Learn More ›

Michael F Arrigo (No World Borders, Inc. (Seattle, San Francisco, Los Angeles, Orange County, San Diego, Denver, St. Louis, Chicago, Dallas, New York, Boston, Nashville, Miami))
Legal Experience - Affirmed by two Federal Judges as Expert, Two State Judges and Arbitrators. Expert has never been excluded. (See separate document for list of cases, testimony, basis for opinions). U.S. District Judge Lew in the Central District,... Learn More ›

Bill Waites (Compupak Advanced Technology, Inc.)
Bill Waites, Consultant & Forensic Expert Witness, Problem Solver - Patents, Copyright, Trade Secrets, Software Development Life Cycle/Project Management, Distributed Antenna System INSTALL & TEST, Data Extraction, Information Technology,Complex Software... Learn More ›

Rhonda Harper, MBA (Harper Litigation Consulting and Research)
"I very strongly recommend Rhonda. She’s great to work with, and her work product is absolutely top-shelf." Greenberg & Traurig, LLP Founded in 2005, Harper Litigation Consulting and Research has been trusted by more than 160 law firms. Ms. Rhonda... Learn More ›
John A. Williams, PhD, PE, ASA, MBA, CFEI, AIChE Fellow (EPS, Inc.)
Location: Indiana
Areas of Expertise: Dr. Williams, the founder of EPS, began his operations, engineering, and construction experience in 1977. His expertise includes analysis of technology development, process design, facilities, utilities,...
Michael A Einhorn, Ph.D. (Media, Technology, and Copyright)
Location: New Jersey
Areas of Expertise: Michael A. Einhorn (Ph.D. Yale, economics) is an economist and expert witness active in valuation of intellectual property and complex commercial litigation He specializes in media, technology, copyright,...
Tal Lavian Ph.D. (Telecommunications, Network Communications, Internet Protocols, Mobile Wireless, and Computer Networking)
Location: California
Areas of Expertise: Specializes in telecommunications, network communications, and Internet protocols, including computer networks, data communications, LAN/WAN, TCP/IP, UDP, VPN, VoIP, streaming media, Chat, SMS, Mobile...
Consolidated Consultants
Location: Multiple Locations
Areas of Expertise: Consolidated Consultants (CCc) continues to deliver high quality expert witness and medical expert witness referrals nationwide since 1995. CCc is the only referral service where you can view the full,...
Bashar Malkawi (University of Arizona)
Location: Arizona
Areas of Expertise: Bashar Malkawi is Global Professor of Practice in Law at University of Arizona. He is well-versed in teaching and providing legal advice with 20+ years' experience in private and public sectors. In addition...
Michael Nranian (AUTOMOTIVE DESIGN ANALYSIS L.L.C.)
Location: Michigan
Areas of Expertise: Michael Nranian Intellectual Property, Patent Litigation, Legal and Technical Compliance, Product Liability Litigation. Licensed attorney in Michigan, Texas, the United States Patent and Trademark Office,...
Makarand (Mark) Hastak, Ph.D., P.E., CCP, CRIS (Hastak Consulting Services)
Location: Indiana
Areas of Expertise: Dr. Hastak is Professor and the Dernlan Family Head of the Division of Construction Engineering and Management as well as Professor of Civil Engineering at Purdue University. He has been involved with...
Frederick C. (Fritz) Kucklick (IMT Consulting, Inc.)
Location: Michigan
Areas of Expertise: Mechanical Engineer with significant business and technical acumen. Complex litigation experience includes Breach of Contract, Patent, Trade Secrets, and Personal Injury. Issues generally involve Industrial...
Leon A. Kappelman, PhD (Solutions-Organizations-Systems, Inc.)
Location: Texas
Areas of Expertise: Professor Leon A. Kappelman, Ph.D. is a research scientist, teacher, author, speaker, and adviser dedicated to helping organizations and individuals better manage their information, technology, human,...
Robert Wanat, PhD (Innov8 Chem LLC (Innov8chem.com))
Location: South Carolina
Areas of Expertise: Robert Wanat, PhD is a Cornell-educated, award-winning chemist with 30+ years of expertise in the chemical industry in polymers, plastics, adhesives, composites, film, sheet, nanotechnology, aerosols,...
Larry Chiagouris (BrandMarketing Services, Ltd. (Nationwide with offices in Colorado, New York, Florida))
Location: Multiple Locations
Areas of Expertise: Nationwide Services: Rare combination of an ADVERTISING and MARKETING expert who has substantial experience as BOTH a SENIOR EXECUTIVE and ACCOMPLISHED ACADEMICIAN. Dr. Larry Chiagouris has served as an...
Brian Sowers (Applied Marketing Science, inc)
Location: Massachusetts
Areas of Expertise: Federal and state level qualified consumer survey expert with more than 25 years market research experience. Principal at Applied Marketing Science, a full-service market research and consulting firm....
Jae Young Bang (Quandary Peak Research)
Location: California
Areas of Expertise: ▶ Ph.D. in Computer Science from USC (software architecture and engineering) ▶ Litigation consulting (patent/copyright infringement, breach of contract; deposition experience) ▶ Due-diligence consulting...
Istvan Jonyer, Ph.D. (Sidespin Group)
Location: California
Areas of Expertise: Dr. Istvan Jonyer is a scientist, engineer, serial entrepreneur, and investor, with extensive research, engineering, and management experience in various areas of computer science both in academia and...
Larry Steven Londre (Londre Marketing Consultants / USC / Pepperdine / CSUN)
Location: California
Areas of Expertise: Marketing Expert; Business and Advertising Expert, since 2002. Problem Solver. Nationally known and respected Marketing, Advertising professional in both practice and theory. Business, Marketing and Media...
Jason A. Engel, CPA, CFE, CIRA, MAFF, CVA, ABV (Engel & Engel, LLP)
Location: California
Areas of Expertise: Engel & Engel, LLP is a Los Angeles CPA firm engaged in the practice of forensic accounting for over 25 years. Mr. Engel has served as an expert witness in over 500 forensic accounting cases including...
Nicholas Carroll
Location: California
Areas of Expertise: Expert witness reports and testimony in defamation/reputation cases, portrayal in a false light, and right to privacy. Areas include: economic damages; maliciously, negligently, or recklessly inflicted...
Brad T Ulrich (Quandary Peak Research, Inc)
Location: Tennessee
Areas of Expertise: Brad Ulrich has a 15+ year career as a computer scientist, tech entrepreneur, and expert consultant. He is trusted by federal agencies and leading software vendors to provide expert analysis and guidance...
Meyer R. Rosen (CPC, CChE, FRSC, FAIC, FACFE, DABFET)
Location: Florida
Areas of Expertise: Mr. Meyer R. Rosen has over thirty-five years of industrial experience in chemistry and chemical engineering. He also has 15 years experience as an Adjunct Professor of Fire Science. He serves as an expert...
Giora J. Tarnopolsky (TarnoTek)
Location: California
Areas of Expertise: Giora Tarnopolsky, D.Sc., a physicist, has a sharp eye for technology, science, and math, including HDD, CD, DVD, Blu-Ray, tape, data storage systems, metrology, servo, industrial processes, automotive...
Isaac Pflaum (Quandary Peak Research)
Location: Illinois
Areas of Expertise: Summary Mr. Pflaum is an IT litigation consultant and source code reviewer. For the last nine years, Mr. Pflaum has specialized in advising clients on patent, copyright, trade secret and software implementation...
Antonio Sarabia II
Location: California
Areas of Expertise: Apparel: During his 25 years of experience, Mr. Sarabia has become intimately familiar with the many business problems - and legal issues - which fashion companies may face. The start of his apparel...
Stephen P. Castell (CASTELL Consulting)
Location: California
Areas of Expertise: Dr Stephen Castell CITP MEWI is an award-winning independent ICT expert witness, management consultant and project manager professional, with extensive experience in risk assessment, quality assurance,...
Vojin G Oklobdzija (Integration Corp. 855 Marina Bay Parkway, Suite 140, Richmond CA 94804)
Location: California
Areas of Expertise: Prof. Vojin G. Oklobdzija is a Life Fellow of IEEE (the highest achievable grade) and 50 years in electronic and computer industry. He is Professor Emeritus from the University of California where he taught...
Chuck Easttom
Location: Texas
Areas of Expertise: Dr. Easttom has almost 30 years of computer industry experience,a doctorate (D.Sc.) in cyber security (dissertation topic: "A Comparative Study Of Lattice Based Algorithms For Post Quantum Computing"),...
Ray Horak (Context Corporation)
Location: Washington
Areas of Expertise: Ray Horak provides litigation support as a consulting expert and testifying expert in cases involving the Telephone Consumer Protection Act (TCPA), product/service misrepresentation, contract disputes,...
David Tollen (Sycamore Legal, PC)
Location: California
Areas of Expertise: David Tollen is an attorney and a lecturer at the U.C. Berkeley Law School. He is the author of the American Bar Association's bestseller, THE TECH CONTRACTS HANDBOOK: Cloud Computing Agreements, Software...
Evan M Levine (181 South Franklin Ave )
Location: New York
Areas of Expertise: Complete Advisors is a New York-based boutique valuation firm that prepares valuations for assets and entities with build-in complexities for estate and tax planning. Nainesh Shah, with 25 years of portfolio...
Patrick Michael O'Leary, MBA, EE, CISSP (ExpertWitness.com)
Location: New York
Areas of Expertise: For over the past 25 years, I have been successfully providing services as a serial entrepreneur in information technology and the internet. During this time, I worked in many different fields across the...
Brian A. Berg (Berg Software Design)
Location: California
Areas of Expertise: Brian Berg has extensive experience with consumer electronics, including data storage devices and interfaces, e.g., Flash Memory, Solid State Disks (SSDs), Disk, Tape, Optical Storage (CD, CD-ROM, DVD,...
Greg Crouse
Location: Texas
Areas of Expertise: Technical Expert Witness - Technology Intellectual Property and Systems Implementation Greg Crouse has spent nearly 30 years in the trenches implementing large technology systems all over the world....
Gary G. Stringham (Gary Stringham & Associates, LLC)
Location: Idaho
Areas of Expertise: 30+ years in the design and testing of software, firmware, and hardware. (Firmware: software that runs machines and devices.) 15 years with Hewlett-Packard’s LaserJet printer design lab. Named inventor...
Jessie Stricchiola (Alchemist Media Inc)
Location: California
Areas of Expertise: Digital discoverability expert, advocate for traffic quality awareness in digital advertising, and activist for algorithmic accountability. 20 year search industry veteran. O'Reilly author and co-author...
Scott Greene (Evidence Solutions, Inc.)
Location: Multiple Locations
Areas of Expertise: For over 35 years, Scott Greene has been helping business owners, CEOs, managers and IT Departments understand data. Scott Collects, Analyzes, and Explains Complex Electronic Evidence in Plain English. He...
Robert M Anderson (The Anderson Edge)
Location: California
Areas of Expertise: I have 35 years as both an underwriter and insurance broker in property-casualty, captive formation and management, management liability, employee benefits, and cyber liability. I have been engaged as...
Donald A Jasko, Esq. (Digital Economics, LLC)
Location: California
Areas of Expertise: Don Jasko has led Digital Economics to become a leading publishing administrator, providing services that integrate the legal principles of copyright law with the financial and economic analytics of royalty...
Fred P. Smith, P.E., CSP. (Alpine Engineering & Design, Inc.)
Location: Utah
Areas of Expertise: Alpine Engineering & Design, Inc. has 6 consulting mechanical engineers. We have a total of nearly 100 years of experience designing mechanical equipment. Our engineers have over 80 U.S. patents on products...
Jonathan H Bari (Bari Consulting Group)
Location: Pennsylvania
Areas of Expertise: Jonathan (Jon) H. Bari has over 30 years of professional experience in the marketing and technology industries, including over 24 years working with and teaching about Internet businesses. Mr. Bari...
Doug Bania (Nevium)
Location: California
Areas of Expertise: Doug Bania is a founding principal of Nevium Intellectual Property Consultants. Nevium is an intellectual property consulting firm specializing in developing IP strategies, IP valuation and monetization...
Dr. / Professor J. Rasty, Ph.D., PE, CFEI, CFII, President & CEO (Real World Forensic Engineering)
Location: Texas
Areas of Expertise: Since 1988, Real-World Forensic Engineering, LLC (“RWFE”) has provided engineering services to industries and government labs, as well as litigation support to both plaintiff and defense attorneys practicing...
Alec Yasinsac
Location: Alabama
Areas of Expertise: As a long time cybersecurity research scientist and voting systems security specialist, my primary consulting area is elections security and integrity. My background includes formal, detailed systems review...
Peter Crosby (Biomedical Business Resources LLC)
Location: California
Areas of Expertise: Peter Crosby has over 40 years' experience in the global medical device industry. He has been CEO of six medical device companies (public and private) in four countries, and has brought many medical devices...
Chuck Dutill, P.E., D.F.E. (Heritage Technical Services, Inc.)
Location: Pennsylvania
Areas of Expertise: For over 40 years Mr. Dutill has been performing hydrology and environmental engineering nationwide. He has focused on wastewater, stormwater, flooding, sewers, septic systems, groundwater, drainage, runoff,...
Todd Stefan (Setec Investigations)
Location: California
Areas of Expertise: Setec Investigations offers unparalleled expertise in computer forensics and electronic discovery, providing highly personalized, case-specific forensic analysis and litigation support services to assist...
Troy D. Drewry, MSBE, MEM (Ragin' Cajun Consulting LLC)
Location: Tennessee
Areas of Expertise: With 20+ years of design and development experience, Troy Drewry provides forensic engineering, litigation consulting and expert witness testimony regarding medical devices, including biomechanical devices...
Richard A. Gottlieb (Global Toy Experts)
Location: New York
Areas of Expertise: Richard Gottlieb has been consulting about the toy industry since 1994 and is highly knowledgable in all aspects of the toy business. He has provided expert witness testimony on behalf of Hasbro, Warner...
Gary D Fletcher, PhD (RnDDx Solutions LLC -- Medical Devices & Biomedical Engineering Expert Witness)
Location: Pennsylvania
Areas of Expertise: Medical Devices, Biomedical Engineering, Mechanical Engineering, R&D, Product Development, Clinical diagnostics, Biospecimens, Point of care testing, Microfluidics, Spectroscopy, Cell therapy, Intellectual...
Sam Malek, PhD (Cyberonix)
Location: California
Areas of Expertise: Sam Malek is a Software Engineering Professor in the Informatics Department within the School of Information and Computer Sciences at the University of California, Irvine. His research is in the field...
Anthony Wechselberger (Entropy Management Solutions)
Location: California
Areas of Expertise: BROADBAND & MULTIMEDIA CONSULTING & EXPERT WITNESS SERVICES Specializing in broadband, multimedia and associated technologies, infrastructures and commercial environments, Mr. Wechselberger brings thirty...
Monty G Myers (Eureka Software Solutions, Inc.)
Location: Texas
Areas of Expertise: Monty G. Myers is the founder and CEO of Eureka Software Solutions, Inc. Mr. Myers, with the support of his team at Eureka, has served as a testifying and consulting software expert witness in over 135...
Renee Howdeshell (Fulcrum Inquiry)
Location: California
Areas of Expertise: Our analysis and research combined with unique presentation techniques have resulted in an unequaled track record in successful court cases and client recoveries. Our personnel are full time and fully...
Stanley P. Stephenson, Ph.D. (Litigation Economics, LLC)
Location: California and Florida
Areas of Expertise: Since 1985, Dr. Stephenson has provided a wide range of economic damages assessment and expert testimony in complex tort and commercial litigation, involving various industries including high-tech manufacturing,...
Howard J Cohen (Cohen Software Consulting, Inc.)
Location: California
Areas of Expertise: Dr. Cohen has over 30 years experience in the architecture and implementation of complex software applications, ranging from bioinformatics (genomics and proteomics) to chip design tools, from banking...
Samuel R. Phillips, PE (Mechanical Engineer and Manufacturing Consultant / Engineering Product Design Expert Witness for Patent Litigation)
Location: California
Areas of Expertise: PRODUCT ENGINEERING DESIGNER AND MANUFACTURING CONSULTANT Samuel R. Phillips is a a consultant in product design engineering, development, and manufacturing, and an expert witness in patent disputes...
Peter Petrovsky PE, ME, CE, IE, A B HAZ & C-12 MULTI-DISCIPLINED ENGINEER & CONTRACTOR (Diversified - lppetrovsky@gmail.com, dewinc@hughes.net, ateco@hughes.net, )
Location: California
Areas of Expertise: Peter Petrovsky, PE, earned registrations as Professional Engineer in Civil Engineering, as well as, in Mechanical Engineering. Additionally, he earned licenses as a General Engineering Contractor, General...
Kathryn Arnold (TheEntertainmentExpert)
Location: California
Areas of Expertise: Kathryn Arnold is a highly sought after Entertainment Consultant and Expert Witness with over 20 years hands on experience in feature film and TV development, production, international sales, and finance....
Theodore G Phelps (FVLS Consultancy)
Location: Washington
Areas of Expertise: Mr. Phelps is a certified public accountant with additional credentials in the disciplines of Business Valuation, Forensic Accounting, Fraud Investigation and Insolvency. He has testified as an expert...
Ugo Buy
Location: Illinois
Areas of Expertise: I have over 30 years specializing in software engineering and programming languages. For the past 10 years I have been involved in investigating mobile app development for native Android, native iOS and...
Eugene Barash (Ph.D.)
Location: New York
Areas of Expertise: Consultant, advisor to Semiconductor, Photonics, MEMs, Life Sciences in Product and Technology development, P&L Management, Semiconductor Fab Operations. Successful expert witness on semiconductors technology...
Sameer Singh Somal (Blue Ocean Global Technology)
Location: Pennsylvania
Areas of Expertise: Sameer Somal is the CEO of Blue Ocean Global Technology and co-founder of Girl Power Talk. He is a frequent speaker at conferences on digital transformation, online reputation management, diversity &...
Scott O. Ganaja, P.E. (PROgressiv Engineering, Inc.)
Location: California
Areas of Expertise: Scott Ganaja specializes in the design and manufacture of bicycles and e-bikes, exercise and medical equipment. He is experienced in matters involving products liability and intellectual property. Mr....
Michael S. Gossman, M.S., DABR, FAAPM, FACR (Regulation Directive Medical Physics)
Location: Kentucky
Areas of Expertise: I am the Chief Medical Physicist in Radiation Oncology at a facility in New Albany, Indiana. I am responsible for all scientific and technical aspects of imaging, treatment and radiation safety and am...
Kerrie Merrifield, CPA, ABV, CFF, MAFF (Axiom Forensics )
Location: California
Areas of Expertise: I am a Forensic CPA who works as an expert witness and testifies nationally, with offices in Los Angeles, California. Our firm specializes in Business Interruption Lost Profits Claims, Forensic Accounting,...
Harry Direen (DireenTech Inc.)
Location: Colorado
Areas of Expertise: Dr. Harry Direen is an electronic and software engineering consultant and innovation expert creating technical solutions for real world systems. Substantial experience as an expert witness in over 20 litigation...
Rob Wallace (Best of Breed Branding Consortium)
Location: New Jersey
Areas of Expertise: Please see the short video at www.RobWallaceExpert.com Unlike an academic expert, Rob Wallace has been actively involved in the brand consulting industry for more than 35 years. For the past 30+ of...
H. Clark Bell Ph.D., P.E.
Location: California
Areas of Expertise: Communications and electronics including radio frequency (RF), microwave, RFID and EAS; electrical and electromechanical equipment; manufacture of engineered products; patents and trade secrets; personal...
Eric F Forister (Econ One Research, Inc.)
Location: California
Areas of Expertise: Dr. Eric Forister is an expert economist with testifying experience on market definition, market power, and damages. His expertise includes applying advanced statistical techniques to datasets, synthesizing...
J. Richard Claywell, CPA, ABV, ASA, CBA, ICVS, CVA, MAFF, CFD, ABAR, CVGA, MBV, ICVS-A
Location: Texas
Areas of Expertise: Preparation of valuation reports since 1985 for Exit Planning, Estate and Gift Tax, Buy/Sell Agreements, Adequacy of Life Insurance, Economic Loss Analysis, Partner Disputes, Dissenting Shareholder Actions,...
Brooks L Hilliard (Business Automation Associates, Inc.)
Location: Arizona
Areas of Expertise: Brooks Hilliard has more than 40 years of computer industry experience working as a consultant, a computer industry executive, a computer systems developer and a computer and software expert witness in...
ForensisGroup, Inc. (The Expert of Experts)
Location: Multiple Locations
Areas of Expertise: For over 30 years, ForensisGroup has provided the nation’s top law firms, businesses, insurance companies, government entities with highly qualified expert witnesses and consultants. Experts referred by...
Fari Barzegar, Ph.D., P.E. (Habitat Engineering & Forensics, Inc.)
Location: California
Areas of Expertise: Expert consultant/witness in over 80 cases with testimony/trial experience. Dr. Barzegar is a licensed professional engineer providing a broad range of services in civil/structural engineering and construction...
Steven G Burgess (Burgess Consulting and Forensics)
Location: California
Areas of Expertise: Burgess Forensics offers Digital / Computer and Mobile Forensics & Electronic Discovery and Expert Witness Testimony - since 1985. Burgess offers Macintosh Digital Forensics, Windows Digital Forensics,...
Robert O. Peruzzi, PhD, PE, DFE (Forensic Engineering / Electronic Design)
Location: Pennsylvania
Areas of Expertise: Licensed Professional Electrical Engineer with a subspecialty in integrated circuits and electrical modules used for signal processing in systems such as telephones and cell phones; data recording and...
Christopher K Wilson (Christopher Wilson Consulting)
Location: California
Areas of Expertise: Mr Wilson has 30 years of experience in the automotive industry developing and building safety systems to address all manner of vehicle accidents. He is a leader in the development of vehicle positioning,...
John C Peck (Bay2Sierra Silicon Services, Inc.)
Location: California
Areas of Expertise: John Peck has over 25 years of experience as a software and hardware engineer with over 10 years of experience as a technical analyst for hardware and software intellectual property cases. He has drafted...
Jason Frankovitz (Quandary Peak Research)
Location: California
Areas of Expertise: As a programmer, CTO, and inventor, Jason Frankovitz has been in the trenches of technology for more than 20 years. He has worked as a software development manager, technical analyst, and mentor in a wide...
Ben Levitan (Telecommunications and Cell Phone Expert)
Location: North Carolina
Areas of Expertise: Wireless, Cellular, PCS, Internet and Telephony Expert Witness Services. Ben Levitan is one of the most sought after legal expert witnesses in multiple telephone and data technological areas. A proven...
Edward J. Yun, M.D.
Location: California
Areas of Expertise: Edward J. Yun, M.D. is board-certified by the American Board of Urology. He attended medical school at Columbia University in New York City, and completed his urology specialty training at the University...
Gabriele Goldaper
Location: California
Areas of Expertise: Ms. Goldaper has more than 45 years experience in the Fashion/Garment/Textile Industry. She has practical knowledge as a retailer, manufacturer, and key executive for major clothing companies. She has...
Alok Gupta (University of Minnesota)
Location: Minnesota
Areas of Expertise: Alok Gupta is Senior Associate Dean of faculty, Research and Administration, and Curtis L. Carlson Schoolwide Chair in Information Management at the Carlson School of Management, University of Minnesota....
William G. Eggington (Brigham Young University)
Location: Utah
Areas of Expertise: Professor Eggington has been a consultant and expert witness in many criminal, civil, federal and state cases involving assessment of English language proficiency, trade name disputes, the grammar and...
Greg Flolid (Flolid Consulting LLC)
Location: Texas
Areas of Expertise: Greg Flolid, MBA, is the President of Flolid Consulting LLC. His medical experience includes CPAPs, Humidifiers, Oxygen Concentrators, Homefill, Oxygen Conserving Devices, Infusion Pumps - Peristaltic...