Vitamin b-12 derivative suitable for radiolabeling
CA 1109464 A · Owner: Bracco International B.V. · Inventors: Varma, Ravi K.; Vogt, Berthold R.; Bernstein, Jack
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Radiolabeled vitamin B12 derivatives having the formula, vitamin , wherein R is hydrogen or alkyl of 1 to 3 carbon atoms; n is 0, 1, 2, 3, or 4; and the asterisk (*) indicates tagging with a radioisotope, are useful as tracers in radioassays.
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
- Granted September 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 22, 1998.
- 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.