Expired Canadian patentCanada
Perfluoropolyether solid fillers for lubricants
CA 1289937 C · Owner: Bierschenk, Thomas R. · Inventors: Lagow, Richard J.; Juhlke, Timothy J.; Bierschenk, Thomas R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Lubricants comprising perfluoropolyether oils containing perfluoropolyether solids as fillers are described.
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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 October 1, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 6, 1987
GrantedOctober 1, 1991
Term endedOctober 1, 2008
Patent numberCA 1289937 C
Classification (IPC)C10M105/18 +2 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.