Preparation of isotopically labelled aminopyrine
CA 1097357 A · Owner: Merck, Sharp & Dohme (I.A.) Corp. · Inventors: Koch, Hans J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Preparation of Isotopically Labelled Aminopyrine ABSTRACT OF THE DISCLOSURE, The present invention relates to preparation of isotopically labelled amines by alkylation with isotopically labelled methyl iodide in the presence of an organic material capable of reaction with the formed hydrogen iodide. Such methylated amines, particularly isotopically labelled aminopyrine, are useful as clinical diagnostic aids in liver function tests.
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 March 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 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.