Elliptical sealing surface for butterfly valve
CA 2497284 C · Owner: Lounsberry, James Leroy · Inventors: Eggleston, Philip Wayne; Hutchens, Wilbur Dean; Lounsberry, James Leroy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reduced component wear valve (10) is comprised of a valve body (12) having a passage therethrough and a disc (14) attached to a rotatable shaft (38). The disc is utilized with a seal (18) forming a gap between the disc and the seal proximate to the rotational axis (16) of the disc. When the disc is in the open position, the seal major axis is greater then the disc diameter and they do not touch. As the disc rotates to near closure the disc perimeter engages , the minor axis of the seal (which is smaller than the disc diameter) and the , disc stretches the seal in the minor axis direction thus decreasing the major axis such that the gap is closed. The seal can be pre-formed in an …
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 July 23, 2003 and granted March 5, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2025.
- 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.