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公开(公告)号:US3179293A
公开(公告)日:1965-04-20
申请号:US23134262
申请日:1962-10-18
Applicant: DONALD G GRISWOLD
Inventor: ENSIGN HAROLD W
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公开(公告)号:US3261382A
公开(公告)日:1966-07-19
申请号:US28100563
申请日:1963-05-16
Applicant: DONALD G GRISWOLD
Inventor: ENSIGN HAROLD W
IPC: F16K21/18
CPC classification number: F16K21/18
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3.Backflow prevention device with improved pressure sensing means 失效
Title translation: 具有改进的压力感测装置的防回流装置公开(公告)号:US3283772A
公开(公告)日:1966-11-08
申请号:US34243964
申请日:1964-02-04
Applicant: DONALD G GRISWOLD
Inventor: ENSIGN HAROLD W
IPC: E03C1/10
CPC classification number: E03C1/106 , Y10T137/2557 , Y10T137/2599 , Y10T137/2622 , Y10T137/7754 , Y10T137/7901
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4.Removable element filter assembly having flow preventing means 失效
Title translation: 具有防流动装置的可拆卸元件过滤器组件公开(公告)号:US3363762A
公开(公告)日:1968-01-16
申请号:US42183364
申请日:1964-12-29
Applicant: DONALD G GRISWOLD
Inventor: ENSIGN HAROLD W
IPC: B01D35/153
CPC classification number: B01D35/153 , B01D29/23 , B01D2201/306
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