Spring check valve cartridge
CA 2122672 A1 · Owner: Distel, Gerald M. · Inventors: Distel, Gerald M.; Kozumplik, Nicholas, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reversible check valve cartridge wherein a sealing disk is urged to the shutoff position by means of a cage mounted umbrella spoke-like spring which is secured to the cage and is fully recessable therein so as to permit full travel of the sealing disk within the cage thereby, permitting increased flow for a given thickness of the valve cartridge. 13
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 May 2, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2016.
- 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.