Near-azeotropic blends for use as refrigerants
CA 2086841 C · Owner: Shiflett, Mark Brandon · Inventors: Shiflett, Mark Brandon; Bivens, Donald Bernard; Yokozeki, Akimichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A near azeotropic composition which is a blend of pentafluoroethane and 1,1,1-trifluoroethane with 1,2,2,2-tetrafluoroethane or 1,1,2,2-tetrafluoroethane in the proportions of 35 to 65 weight percent of pentafluoroethane 30 to 60 weight percent of 1,1,1-trifluoroethane and 3 to 15 weight percent of 1,1,2,2-tetrafluoroethane or 1,2,2,2-tetrafluoroethane.
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 June 17, 1991 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2013.
- 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.