Expired Canadian patentCanada
Topical composition containing an ester of pyroglutamic acid
CA 1324759 C · Owner: Unilever Plc · Inventors: Scott, Ian Richard
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous composition for topical application to human skin comprises:, (i) a special ester of pyroglutamic acid; (ii) a cosmetically acceptable aqueous buffer having an effective pH value of from 2 to <7; and (iii) optionally, other cosmetic adjuncts.
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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
- Granted November 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 10, 1989
GrantedNovember 30, 1993
Term endedNovember 30, 2010
Patent numberCA 1324759 C
Classification (IPC)A61K8/49 +1 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.