Non-azeotropic refrigerant compositions comprising difluoromethane; 1,1,1-trifluoroethane; or propane
CA 2105565 C · Owner: Allied-Signal Inc. · Inventors: Shankland, Ian R.; Richard, Robert Gerard; Singh, Rajiv Ratna
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides refrigerant blends which are replacements for chlorodifluoromethane (HCFC-22). The, present blends have refrigeration characteristics which are similar to HCFC- 22. The blends comprise from about 10 to about 90 weight percent of a first component selected from the group consisting of 1,1,1-trifluoroethane, difluoromethane propane, and, mixture thereof; from about 1 to about 50 weight percent of a second component selected from the group consisting of hydrofluorocarbon having 1 to 3 carbon atoms, fluorocarbon having 1 to 3 carbon atoms inorganic compound, and mixtures thereof having a boiling point at atmospheric pressure in the range from about -90 degrees …
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 February 12, 1992 and granted November 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2014.
- 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.