Valve spring anti-rotation apparatus
CA 2412959 A1 · Owner: Hegemier, Timothy A. · Inventors: Hegemier, Timothy A.; Fisher, Steven M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve stem seal assembly includes several protrusions or bumps on the bottom of a spring seat flange or on a spring wear washer surrounding the seal. The, protrusions can be either cast formed or machined in place. In described embodiments, the protrusions are adapted to engage corresponding depressions holes, or receptors in a cylinder head deck surface against which the flange or wear washer, abuts. A positive mechanical anchor is thereby created for resisting any torque, applied to the flange or washer through mechanical vibration induced rotation of the, valve spring. Sliding contact is thereby avoided at the interface between the flange or, washer and the cylinder head and wear …
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 November 27, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2024.
- 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.