Halogenated hydrocarbon refrigerant compositions containing polymeric oil-return agents
CA 2314080 A1 · Owner: Shealy, Glenn Scott · Inventors: Spauschus, Hans O. (Deceased); Feiring, Andrew Edward; Shealy, Glenn Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Refrigerant compositions containing polymeric oil-return agents which solubilize or disperse mineral and synthetic oil lubricants with hydroflurocarbon and hydroflurocarbon/hydrochlorofluorocarbon-based refrigerants are disclosed. These polymeric oil-return agents such as , copolymers of fluorinated and non-fluorinated methacrylates as a small , proportion of an overall refrigerant composition permit efficient return of , mineral and synthetic oil lubricants from non-compressor zones back to a compressor zone in a refrigeration system operating with hydrofluorocarbon and hydrofluorocarbon/hydrochlorofluorocarbon-based refrigerants.
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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
- Filed January 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 15, 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.