Coextruded valve stem seal
CA 2316760 A1 · Owner: Hegemier, Timothy A. · Inventors: Hegemier, Timothy A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coextended valve stem seal is provided that includes a sleeve having an upper and lower portion, a central vertical axis and a generally concentric , aperture. The sleeve includes an inner layer an inner layer of a resilient sealing material, such, as a rubber, and an outer layer of a coextrudable rigid material such as a , plastic, material. The lower portion of a preferred embodiment of the sleeve may include a, radially extending flange. A method for making the valve stem seal in accordance, with the principles of the invention is also disclosed.
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 August 29, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 29, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2022.
- 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.