Pyrimidine 2'-methylidene nucleoside compounds
CA 2004752 C · Owner: Yoshitomi Pharmaceutical Industries Ltd. · Inventors: Yamagami, Keiji; Sasaki, Takuma; Ueda, Tohru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pyrimidine 2'-deoxy-2'-methylidene nucleoside compounds:, wherein R1 represents amino hydroxy, silylamino, silyloxy, acylamino or acyloxy; R2 represents hydrogen halogen, a lower, alkyl, a lower alkenyl a lower alkynyl or haloalkyl; R3 and, R4 represent the same or different hydrogen silyl, acyl or, aminoacyl, or a pharmaceutically acceptable salt or hydrate thereof, except that R1 is amino or hydroxy and both R3 and, R4 are hydrogen. These compounds possess excellent antitumor and antiviral activities, thus providing novel anticancer and antiviral agent.
Read the whole patent
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 6, 1989 and granted July 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 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
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.