Zinc cysteate, its preparation and uses in pharmacy and cosmetology
CA 2001889 C · Owner: Chimie Et Biologie · Inventors: Guillard, Olivier; Blum, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to the new anhydrous or hydrated zinc cysteate of formula:, and especially its dihydrate. The present invention also relates to a process for the preparation of the new zinc cysteate comprising reacting a salt, oxyde or hydroxyde of zinc with cysteic acid or a salt of it, or reacting zinc peroxide with cystine or cysteine. The present invention also relates to the uses of the new zinc cysteates, notably as in its dihydrated form in, pharmaceutical and cosmetological preparations.
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 October 31, 1989 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2011.
- 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.