Device for preventing water hammer while regulating water pressure
CA 2004175 C · Owner: Kimura, Yasuhide · Inventors: Kimura, Yasuhide; Motohashi, Takeshi; Fujishima, Yukihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Device for preventing water hammer while regulating water pressure includes valve-element biasing means which substantially consists of a pressure-adjusting spring with a small spring constant and a water-hammer preventing spring with a large spring constant which are disposed in series in a valve casing. The valve-element biasing means is capable of varying the opening area of a communicating passage which communicates an upstream passage with a downstream passage so as to adjust the pressure in the communicating passage while preventing the occurrence of water hammer in pipings and/ water supply equipments.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 29, 1989 and granted December 20, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.