Dry valve stem seal
CA 2358889 A1 · Owner: Dana Corporation · Inventors: Hegemier, Tim
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 two annular hydraulic seals separated by a generally flat support member, where the seals are axially positioned back to back, on an upper free end of a valve stem. The seals and the washer are secured along a, radially outer circumference by a retainer a lower portion of which contacts , an upper surface of a valve guide. The valve stem is slideably sealed by an inner annular, surface of both hydraulic seals.
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 October 9, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 2023.
- 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.