Radionuclide labeling of vitamin b12 and coenzymes thereof
CA 2237263 C · Owner: Collins, Douglas A. · Inventors: Collins, Douglas A.; Hogenkamp, Henricus Petrus Cornelis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound useful for in vivo imaging of organs and tumors is provided of formula (1) wherein (a) is cobalamin, (b) derived from a corrin carboxylic acid group of said cobalamin, Y is a linking group and X is a chelating group optionally comprising a detectable radionuclide or a paramagnetic metal ion and n is 1-3.
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 12, 1996 and granted July 31, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2018.
- 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.