Compositions and process of using in refrigeration
CA 2021916 A1 · Owner: Cripps, Harry N. · Inventors: Cripps, Harry N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title, Compositions and Process, of Using in Refrigeration Abstract of Disclosure, A blend of refrigerant with at least one fluorinated hydrocarbon, comprising at least one graft of a perfluoroalkene or a perfluoroalkylvinyl ether onto at least one alkane having at least four (4) carbon atoms, the number of carbon atoms in the alkane and the number of grafts of the perfluoro compound being such as to provide a lubricant which has an SUS viscosity at 100°F of at least 50 and a pour point of less than about -l0°C is disclosed for use in compression refrigeration. CR-8750
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 July 25, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 2012.
- 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.