Camptothecin .beta.-alanine esters with topoisomerase i inhibition
CA 2396030 C · Owner: Manikumar, Govindarajan · Inventors: Balasubramanian, Neelakantan; Vyas, Dolatrai; Wani, Mansukh C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
beta.-Alanine esters of camptothecin compounds having the structure: which are effective anti-tumor compounds are disclosed. These compounds inhibit , the enzyme topoisomerase I and may alkylate DNA of the associated topoisomerase I-, DNA cleavable complex.
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 June 14, 2000 and granted March 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 14, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 2022.
- 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.