Novel tetrapeptides, their preparation and use
CA 2189691 C · Owner: Amberg, Wilhelm · Inventors: Bernard, Harald; Ritter, Kurt; Amberg, Wilhelm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I) are disclosed wherein R1, R2, R3, and R4 have the , meanings indicated in the description as well as a process for the production of these compounds. The compounds are suitable for use as starting material for the synthesis of substances which have anti-tumour properties.
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 April 26, 1995 and granted February 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2017.
- 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.