Expired Canadian patentCanada
Medical process - use of dichlorodifluoromethane (cc1_f_) and chlorodifluoromethane (chc1f ) as cryogens for treating skin lesions
CA 2021375 C · Owner: Mcdow, Ronald A. · Inventors: Mcdow, Ronald A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Use of CC12F2 or CHC1F2 to perform cryogenic surgery on a variety of skin lesions is described.
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 17, 1990 and granted April 30, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 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.
FiledJuly 17, 1990
GrantedApril 30, 1996
Term endedJuly 17, 2010
Patent numberCA 2021375 C
Classification (IPC)A61K31/02 +2 more
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.