Seals
CA 1185585 A · Owner: The British Petroleum Company P.L.C. · Inventors: Ells, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sealing assembly (20) for a ball valve comprises two non compressible and relatively movable members for example the ball, (24) and seal housing (26) of a ball valve having located, therebetween a sealing element (32) which is inflatable by the introduction of hydraulic fluid. The sealing element (32) is located in a recess in member (26) so that when the hydraulic pressure is released the element (32) retracts into the recess to release the sealing engagement and facilitate the relative movement of members (24 26). A resilient, rubber ring (40) is provided to bias the seal housing (26) away from the position of sealing engagement to also facilitate movement of members (24, 26). A second …
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
- Granted April 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2002.
- 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.