Metering valve stem seal
CA 1331153 C · Owner: Duvall, Kelly E. · Inventors: Bunce, Dean S.; Lafever, Edward E.; Duvall, Kelly E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title, METERING VALVE STEM SEAL, Abstract of the Invention A valve stem seal provides an elastomeric main valve body having an upper working portion and a lower support portion the, latter for support of the seal on a valve guide member. The seal contains a central helically threaded internal region adapted to meter oil flow between the valve guide and a valve stem reciprocally moveable with the guide. The upper working portion defines a pair of ends, wherein each end contains a non-threaded internal portion defining a plurality of alternately arranged axially extending grooves and ribs. The grooves provide oil flow passageways, while the ribs support the ends of the working portion against …
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 August 2, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 2, 2011.
- 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.