Refrigerant compositions
CA 2264303 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Corr, Stuart; Murphy, Frederick Thomas; Powell, Richard Llewellyn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition is described which comprises (A) at least one compound selected from the group consisting of carbon dioxide (CO2) and the hydrofluorocarbons having a boiling point in the range of from -80 ~C to -40 ~C (B) at least one , hydrofluorocarbon selected from the group consisting of 1,1,1,2tetrafluoroethane (R-134a), 1,1,2,2-tetrafluoroethane (R-134) and 1,1difluoroethane (R-152a), and (C) at least one hydrofluorocarbon selected from the group consisting of 1,1,1,3,3,3-hexafluoropropane (R-236fa) and 1,1,1,2,3,3-hexafluoropropane (R-236ea). The composition is useful as a refrigerant and may be used in automobile air conditioning and domestic refrigeration systems as a …
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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 August 18, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2019.
- 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.