Expired Canadian patentCanada
Air-oil seal
CA 2528659 C · Owner: Pratt & Whitney Canada Corp. · Inventors: Cheung, Kin-Leung; Hung, William
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air-oil seal having a runner surface comprising at least one component selected from the group consisting of: polyetheretherketone; polyetherimide; polyphenylene sulfide; and polyetherketoneketone.
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 28, 2005 and granted August 14, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 28, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 28, 2005
GrantedAugust 14, 2012
Term endedNovember 28, 2025
Patent numberCA 2528659 C
Classification (IPC)F16J15/45 +1 more
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.