5-substituted 2,3-dihydrobenzofuran-2-carboxylic acids and derivatives thereof
CA 1190237 A · Owner: Abbott Laboratories · Inventors: Lee, Cheuk M.; Parks, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described are compounds of the formula wherein R1 and R2 independently of one another denote hydrogen or loweralkyl; A is CO CH2, O, S, SO, or CHOH; X is hydrogen, halo loweralkyl, or, -CH2NR1R2 wherein R1 and R2 are as defined above; W is COOR wherein R is hydrogen or alkyl of 1-10 carbon atoms, CH2OH, CONR1R2 or CH2NR1R2 wherein R1 and R2 are as defined above; Z1 and Z2 independently of one another denote hydrogen halo, or loweralkyl; and pharmaceutically acceptable salts thereof. The compounds are effective as diuretic agents.
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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
- Granted July 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2002.
- 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
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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.