Cationic film-forming polymer compositions containing same, and uses thereof, including topical delivery system and method of delivering agents to the skin and hair
CA 2275567 A1 · Owner: Macrochem Corporation · Inventors: Krauser, Scott F.; Samour, Carlos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mixture of lipophilic and amphiphilic/hydrophilic film-forming polymers of the formula (I) R-(CO)mY1-(CH2CHR1O)n- CONH-Z-NHCO(OCH2CHR2)n'-Y2- (CH2CHR2O)n''p -CONH-Z-NHCO-(OCH2CHR1)n-Y1(CO)mR where R represents (i) an alkyl, alkenyl or alkaryl group of from 1 to 30 carbon atoms or (ii) a polypropylene oxide group or polybutylene oxide group; R1 and R2 each, independently, represent a hydrogen atom or a methyl or ethyl group; Z , represents a divalent linking hydrocarbyl group; m is 0 or 1; when m = 0 Y1 , represents O, NR3 or N+R3R4X- and when m = 1 Y1 represents O; Y2 represents O NR3, N+R3R4X-, (R3NCH2CH2)t, or (R3R4N+CH2CH2)X-t; R3 and R4 independently, represent C1-C22 alkyl; X …
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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 23, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2019.
- 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.