Modulation rotary valve
CA 2172901 C · Owner: Griffin, Scott · Inventors: Griffin, Scott; Brillant, Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A self wear compensating valve for controlling flow of a fluid employs seals for sealing between relatively moving parts. In one of the parts an annular recess is formed. A conformable sealing member is placed in the recess and a spring biased to, expel the conformable sealing member and press it against a sealing surface on the other part is provided. An O-ring placed on the outside of the conformable sealing member prevents leakage of fluid through the recess outside of the conformable sealing member. As the conformable sealing member is worn away after many cycles of the valve, the spring continues to press it against the sealing surface, while the O-ring continues to prevent leakage of …
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 March 28, 1996 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2018.
- 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.