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John A. Purbrick

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  • Arlington, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Electronic stethoscope
    • Patent number 6,005,951
    • Issue date Dec 21, 1999
    • StethTech Corporation
    • James A. Grasfield
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Grant

    Electronic stethoscope
    • Patent number 6,002,777
    • Issue date Dec 14, 1999
    • StethTech Corporation
    • James A. Grasfield
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Grant

    Electronic stethoscope
    • Patent number 5,825,895
    • Issue date Oct 20, 1998
    • StethTech Corporation
    • James A. Grasfield
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE

Patents Applicationslast 30 patents

  • Information Patent Application

    Electronic stethoscope
    • Publication number 20080037800
    • Publication date Feb 14, 2008
    • James A. Grasfield
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Application

    Electronic stethoscope
    • Publication number 20070154024
    • Publication date Jul 5, 2007
    • James A. Grasfield
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Application

    Electronic stethoscope
    • Publication number 20030072457
    • Publication date Apr 17, 2003
    • James A. Grasfield
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE