Vitamin e derivatives
CA 2315679 A1 · Owner: Ito, Kazuhiko · Inventors: Iemura, Masahito; Ito, Kazuhiko; Nakao, Hidetoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel vitamin E derivatives represented by general formula (I) or pharmacologically acceptable salts thereof which are useful as hepatopathy inhibitors, anticataract agents, cerebral metabolism activators antioxidants , and cosmetic components. In Formula (I) R1 and R2 are the same or different , and each represents hydrogen or methyl; R3 represents an SH compound bonded via an S-bond selected from among glutathione .gamma.-glutamylcysteine, cysteine, penicillamine esters thereof and cysteamine; and R4 represents hydroxy, an N-substituted amino acid selected from among glycine .beta.-, alanine, .gamma.-aminobutyric acid 5-aminovaleric acid, .epsilon.-, aminocaproic acid anthranilic …
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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 18, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 18, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2020.
- 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.