Liner for a split seat gate valve
CA 2069763 C · Owner: Warman International Limited · Inventors: Kimpel, Alvin A.; Owens, Brian S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gate plate assembly (20) has two aligned and connected body housing members (26) which each have a gate slot above a through passage which is above a seat portion slot. Gaskets (30) are compressed by the body housing members (26) to form a liquid-tight seal along the valve sides. Two resilient valve liners (24) are fitted between and compressed by the body housing members (26). Each valve liner (24) has a body with a planar front face (40) and a cylindricalthrough passage (44) which extends through the liner body. A seat portion (64) extends downwardly from the body of each liner (24) and increases in thickness as it extends from the body. The valve liners (24) are compressed within the …
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 31, 1991 and granted October 25, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2013.
- 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.