Expired Canadian patentCanada
Refrigerant lubricant compositions
CA 2048909 C · Owner: Union Carbide Chemicals & Plastics Corporation · Inventors: Brown, William L.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Antiwear additives for refrigerant lubricant compositions and refrigerant lubricant compositions containing said antiwear additives are disclosed for use in compression refrigeration applications.
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 August 9, 1991 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2013.
- 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 9, 1991
GrantedAugust 11, 1998
Term endedAugust 9, 2011
Patent numberCA 2048909 C
Classification (IPC)C10M137/04 +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.