Polyol ester lubricant composition for use with tetrafluoroethane refrigerant
CA 2069076 A1 · Owner: Sanvordenker, Keshav S. · Inventors: Sanvordenker, Keshav S.; Mcdonnell, Dennis W.; Karnaz, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lubricant composition for use with tetrafluoroethane refrigerant in a hermetic compressor. The lubricant composition comprises a polyol ester lubricant, and a stabilizer for the lubricant. The stabilizer is a triaryl phosphate wherein the, stabilizer is present in an amount not exceeding 10 weight percent of the lubricant. A refrigerant composition comprising a tetrafluoroethane refrigerant, an effective amount to provide lubrication of a polyol ester, and a stabilizer for the lubricant, said stabilizer being present in an amount not exceeding 10 weight percent of the lubricant is also provided.
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 May 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2014.
- 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.