Molecular complex and control-release of alpha hydroxyacids
CA 2286730 A1 · Owner: Van Scott, Eugene J. · Inventors: Yu, Ruey J.; Van Scott, Eugene J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compositions comprising an alpha hydroxyacid or related acid and organic complexing agent having a molecular weight ranging preferably between about 100 and about 600 can form a control-release molecular complex. Such complexing agent preferably possesses one or more amino group in addition to other groups with unshared electrons such as hydroxyl carbonyl, amido, ester , and alkoxyl groups in the same molecule. Such functional groups are capable of forming multiple intermolecular hydrogen bonds with the hydroxyl groups of a free alpha hydroxyacid or related acid. The complexing agents include amino acid esters, non-amphoteric amino acid amides aminosaccharides, aminoalditols , and …
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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 April 10, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 2020.
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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.