.beta.-amino-boronic acid derivatives
CA 2004303 A1 · Owner: Ruppert, Dieter · Inventors: Ruppert, Dieter; Kleemann, Heinz-Werner; Urbach, Hansjorg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure:, .beta.-Amino-boronic acid derivatives The invention relates to compounds of the formula I in which, A denotes a radical of the formula II III or IV, (II), (III), (IV), and R1 to R12 are defined as stated in the description and a process for their preparation, agents containing these compounds and the use thereof.
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 November 30, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.