TREA

Rand H. Ackroyd

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  • Methuen, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Flapper check valve
    • Patent number 6,050,293
    • Issue date Apr 18, 2000
    • Watts Investment Company
    • Ping Lin
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Flapper check valve
    • Patent number 5,855,224
    • Issue date Jan 5, 1999
    • Watts Investment Company
    • Ping Lin
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Temperature-sensitive safety valve assembly
    • Patent number 5,642,859
    • Issue date Jul 1, 1997
    • Watts Investment Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Backflow preventer and test cock assembly
    • Patent number 5,566,704
    • Issue date Oct 22, 1996
    • Watts Investment Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Poppet check valve
    • Patent number 5,564,467
    • Issue date Oct 15, 1996
    • Watts Investment Company
    • Rand H. Ackroyd
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Sewer drain trap primer valve
    • Patent number 5,287,877
    • Issue date Feb 22, 1994
    • Watts Investment Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Double check backflow preventer with improved toggle linkage check...
    • Patent number 5,236,009
    • Issue date Aug 17, 1993
    • Watts Investment Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Toggle linkage check valve
    • Patent number 5,176,172
    • Issue date Jan 5, 1993
    • Watts Regulator Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Anti-siphon frost-proof water hydrant
    • Patent number 5,129,416
    • Issue date Jul 14, 1992
    • Watts Regulator Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Piston pressure-type vacuum breaker
    • Patent number 5,125,429
    • Issue date Jun 30, 1992
    • Watts Regulator Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Toggle linkage check valve
    • Patent number 5,072,753
    • Issue date Dec 17, 1991
    • Watts Regulator Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Ball valve lock plate
    • Patent number 5,052,655
    • Issue date Oct 1, 1991
    • Watts Regulator Company
    • Rand H. Ackroyd
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Anti-siphon frost-proof water hydrant
    • Patent number 5,029,603
    • Issue date Jul 9, 1991
    • Watts Regulator Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Tamperproof coupling
    • Patent number 4,821,763
    • Issue date Apr 18, 1989
    • Watts Regulator Company
    • Rand H. Ackroyd
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Backflow preventer
    • Patent number 4,241,752
    • Issue date Dec 30, 1980
    • Watts Regulator Company
    • Rand H. Ackroyd
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Double-jet acting trap primer
    • Patent number 4,000,752
    • Issue date Jan 4, 1977
    • Watts Regulator Company
    • Louis M. Miller
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...