Expired Canadian patentCanada
Lubricating oil compositions containing bis-mannich base deposit inhibitors and a process for their preparation
CA 1292995 C · Owner: Chevron Research And Technology Company · Inventors: Harrison, James J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are Bis-Mannich base deposit inhibitors; lubricating oil compositions containing these inhibitors and a process for preparing these inhibitors.
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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 December 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 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.
FiledMarch 27, 1987
GrantedDecember 10, 1991
Term endedDecember 10, 2008
Patent numberCA 1292995 C
Classification (IPC)C07C227/16 +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.