Naphthalene carboxylic acids
CA 2004696 A1 · Owner: Hoffmann-La Roche(F.) Ag · Inventors: Lemahieu, Ronald A.; Carson, Matthew; Han, Ru-Jen L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Naphthalene carboxylic acid derivatives of the formula I, wherein one of R1 and R2 is -(CHR10)m-C(O)OR and the other is hydrogen, wherein R is hydrogen or lower alkyl, R10 is hydrogen or lower alkyl and m is, 0 or 1, A is, A', wherein R3 is hydrogen or acyl R4 is hydrogen, halogen, lower alkyl, aryl or cycloalkyl R5 and R6, independently are hydrogen or halogen and n is an, integer from 2-10, or, A is A", wherein R3 is hydrogen or acyl, R7 is hydrogen or lower alkyl, R8 and R9, independently, are hydrogen lower alkyl or halogen, t is 0 or 1. and n is an integer from 2-10, and, when R10 is lower alkyl enantiomers and racemates, thereof, and when R is hydrogen, salts thereof with …
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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 6, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have 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.