Inventor · disambiguated record
Rand H. Ackroyd
Also filed as: ACKROYD RAND · ACKROYD RAND H
17 granted patents·1 pending application·527 citations·filing 1975–2003
95Inventor score
Top patents by PatentIndex Score
18 records- 0184US5236009ADouble check backflow preventer with improved toggle linkage check valveWATTS INVESTMENT CO·Filed 1992·Granted Aug 17, 1993·60 cites·20 claims
- 0284US5125429APiston pressure-type vacuum breakerWATTS REGULATOR CO·Filed 1991·Granted Jun 30, 1992·53 cites·6 claims
- 0383US5029603AAnti-siphon frost-proof water hydrantWATTS REGULATOR CO·Filed 1990·Granted Jul 9, 1991·50 cites·8 claims
- 0482US5129416AAnti-siphon frost-proof water hydrantWATTS REGULATOR CO·Filed 1991·Granted Jul 14, 1992·47 cites·6 claims
- 0581US5566704ABackflow preventer and test cock assemblyWATTS INVESTMENT CO·Filed 1995·Granted Oct 22, 1996·50 cites·7 claims
- 0674US5341987ATemperature control flow valveWATTS INVESTMENT CO·Filed 1992·Granted Aug 30, 1994·42 cites·21 claims
- 0771US5072753AToggle linkage check valveWATTS REGULATOR CO·Filed 1991·Granted Dec 17, 1991·38 cites·9 claims
- 0870US5052655ABall valve lock plateWATTS REGULATOR CO·Filed 1990·Granted Oct 1, 1991·31 cites·6 claims
- 0967US5855224AFlapper check valveWATTS INVESTMENT CO·Filed 1996·Granted Jan 5, 1999·32 cites·15 claims
- 1065US6050293AFlapper check valveWATTS INVESTMENT CO·Filed 1999·Granted Apr 18, 2000·21 cites·15 claims
- 1160US5287877ASewer drain trap primer valveWATTS INVESTMENT CO·Filed 1992·Granted Feb 22, 1994·20 cites·5 claims
- 1260US4821763ATamperproof couplingWATTS REGULATOR CO·Filed 1988·Granted Apr 18, 1989·21 cites·4 claims
- 1356US4241752ABackflow preventerWATTS REGULATOR·Filed 1978·Granted Dec 30, 1980·14 cites·17 claims
- 1452US4000752ADouble-jet acting trap primerWATTS REGULATOR CO·Filed 1975·Granted Jan 4, 1977·14 cites·12 claims
- 1548US5564467APoppet check valveWATTS INVESTMENT CO·Filed 1994·Granted Oct 15, 1996·12 cites·6 claims
- 1644US5176172AToggle linkage check valveWATTS REGULATOR CO·Filed 1991·Granted Jan 5, 1993·10 cites·9 claims
- 1744US2004231721A1Spill-resistant relief valveFiled 2003·Application pending·0 cites
- 1841US5642859ATemperature-sensitive safety valve assemblyWATTS INVESTMENT CO·Filed 1996·Granted Jul 1, 1997·12 cites·4 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →