Carbamate derivatives of 4-amino-3- isoxazolidinones, 3-amino-1- hydroxypyrrolidin-2-ones and 1-amino-1- cyclopropanecarboxylic acid analogs, a process for their preparation and their use as medicaments
CA 2079548 C · Owner: Martin, Lawrence Leo · Inventors: Martin, Lawrence Leo; Flanagan, Denise Mary
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Carbamate Derivatives of 4-Amino-3-isoxazolidinones 3-Amino-1-hydroxypyrrolidin-2-ones and 1-Amino-1-cyclopropanecarboxylic acid analogs, a process for their preparation and their use as medicaments (see formula I), where R1 is, (see formulas II III or IV), and R2 is, (see formulas V VI or VII), and to a process for their preparation. The compounds are useful for alleviating various memory dysfunctions characterized by a cholinergic deficit such as Alzheimer's disease.
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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 September 30, 1992 and granted March 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2014.
- 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.