Carboxylic acid derivatives
CA 2022747 C · Owner: Basf Aktiengesellschaft · Inventors: Rohr, Wolfgang; Kuekenhoehner, Thomas; Eicken, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Carboxylic acid derivatives of the general formula (I): (see above formula), where, R1 and R2 are each C1-C4-alkyl C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy and/or C1-C4-alkylthio; R3 is hydrogen, hydroxyl, cyano, nitro formyl, halogen, unsubstituted or substituted amino C1-C4-alkyl, C1-C4-alkoxy, C3-C6-alkenyl C3-C8-alkenyloxy, C3-C6-alkynyl or, C3-C6-alkynyloxy; R4 is hydrogen or C1-C4-alkyl;, R5 is unsubstituted or substituted five-membered hetaryl or isoxazolinyl or -CR6=NOR7;, R6 is hydrogen or unsubstituted or substituted C1-C4-alkyl, C3-C8-cycloalkyl or phenyl; R7 is unsubstituted or substituted C1-C4-alkyl C3-C8-alkenyl, C3-C8-cycloalkyl or phenyl; A is oxygen or sulfur;, X …
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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 August 7, 1990 and granted November 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 2012.
- 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.