Refrigerating machine oil composition
CA 2325503 A1 · Owner: Takesue, Masahiko · Inventors: Takesue, Masahiko; Sakanoue, Shuichi; Takagi, Minoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A refrigerating machine oil composition which is less apt to cause capillary tube clogging in the case where a hydrofluorocarbon hydrocarbon, ether, carbon dioxide, or ammonia refrigerant is used. The composition comprises a base oil comprising at least one oxygenic synthetic oil selected among polyvinyl ethers and polyol esters and either a specific polyalkylene glycol alkyl ether or an alkylbenzene having a number-average molecular weight of 100 to 1,000, the amounts of the ether and the alkylbenzene being 1 to 20 wt.% and 1 to 40 wt.%, respectively, based on the whole composition.
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 12, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 2021.
- 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.