N.alpha.-2-(4-nitrophenylsulfonyl)ethoxycarbonyl-amino acids
CA 2212052 C · Owner: Samukov, Vladimir Vasilyevich · Inventors: Samukov, Vladimir Vasilyevich; Sabirov, Ayda Nadzhatovich; Pozdnyarkov, Pavel Ivanovich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Protected amino acid derivatives of general formula (I) wherein R1 represents hydrogen atom, and R2 represents hydrogen methyl, isopropyl, 1-methylpropyl, 2-methylpropyl tert-butoxymethyl, 1-tert-butoxyethyl, 2-methylthioethyl benzyl, carboxamidomethyl, 2-carboxamidoethyl tert-butoxycarbonylmethyl, 2-, (tert-butoxycarbonyl)ethyl 4-(tert-butoxycarbamido)butyl, 4-tertbutoxybenzyl, indolyl-3-methyl, S(triphenylmethyl)thiomethyl 1-, (triphenylmethyl)imidazolyl-4-methyl 3-(NG-, mesitylenesulfonyl)guanidinopropyl N-xanthylcarboxamidomethyl, 2-(N-, xanthylcarboxamido)ethyl or S-(acetamidomethyl)thiomethyl; or R1 and R2 together represent propylene radical. Methods for the preparation of said …
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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 January 27, 1996 and granted September 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.