Piperidinyl benzimidazoles
CA 2000468 C · Owner: Carr, Albert Anthony · Inventors: Kane, John Michael; Carr, Albert Anthony; Cheng, Hsien Chang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a new class of piperidinyl benzimidazole derivatives of the formula: wherein Y is represented by CO or CHOH; m is an integer from 1 to 2; R is represented by C1-4 alkyl C1-4 alkoxy, halogen, hydroxy and hydrogen; X is represented by hydrogen, COOR2 in which R2 is represented by a C1-4 alkyl or, X is an alkylene phenyl radical of the formula: wherein T is represented by CHOH, CO, O or a direct bond;, R1 is represented by C1-4 alkyl C1-4 alkoxy, halogen, hydroxy, 2,2-dimethyl ethanoic acid and hydrogen; n is an integer from 1 to 5; and pharmaceutically acceptable acid addition salts thereof; which are useful as antihistamines.
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 October 11, 1989 and granted March 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 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.