Dermal uses of non-irritating retinoids
CA 2004861 C · Owner: Parish, Harlie A. · Inventors: Purcell, William P.; Parish, Harlie A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
22-, The dermal use of non-irritating retinoids such as the esters and amides of 13-cis and 13-trans-retinoic acid for effecting the reduction and reversal of photoaging and skin cancer is disclosed. The retinoids having the formulae: , wherein R is, , , , , , , , , , , , , and , wherein X is -H, -F, -Cl, -Br, -I -OH, -OR, -OR', , , , -CN, -NO2, -NH2, -NHR' or -NR'2; wherein n is a number from 1 to 5; wherein R' is H or any of the lower alkyls ranging from C1 to C6; wherein R" is -OR', , or -R'; wherein each R~ is, R' or the hydrocarbon backbone of fatty acids; and further where there are two or more R', R", or R~ groups attached to the same carbon or nitrogen each R', R", or R~ may be …
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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
- Filed December 7, 1989 and granted May 12, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 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
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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.