Valve seal assembly with straight-walled retainer
CA 2423573 A1 · Owner: Dana Corporation · Inventors: Williamson, Alexander S.; Hegemier, Timothy A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radially compliant valve stem seal assembly is adapted for installation over a valve guide of an internal combustion engine. The assembly includes a metallic, cylindrical straight-walled retainer with an elastomeric sealing element chemically, bonded to the interior surface of the retainer. The sealing element includes upper and, lower portions; the upper portion includes a pair of sealing lips comprising an oil, sealing lip and a gas sealing lip. The lips are adapted to meter oil through an interface, between the seal assembly and the associated valve stem for assuring proper lubrication at the interface. The lower portion of the elastomeric sealing element, provides one or more …
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 March 27, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 27, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 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.