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David Henry Hamm Jr.

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  • Rehoboth, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Security clutch with self-centering spring
    • Patent number 6,557,220
    • Issue date May 6, 2003
    • B. A. Ballou & Co., Inc.
    • David H. Hamm
    • Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Information Patent Grant

    Security clutch with unitary trigger and spring
    • Patent number 6,389,662
    • Issue date May 21, 2002
    • B. A. Ballou & Co., Inc.
    • David Henry Hamm
    • A44 - HABERDASHERY JEWELLERY
  • Information Patent Grant

    Security clutch
    • Patent number 6,317,941
    • Issue date Nov 20, 2001
    • B. A. Ballou & Co., Inc.
    • David Henry Hamm
    • A44 - HABERDASHERY JEWELLERY