Perfluoroalkyl-iodo norbornane compounds and their use as surfactants
CA 1108625 A · Owner: Novartis Ag · Inventors: Brace, Neal O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula and the anhydrides or imides thereof, wherein Rf is a perfluoroalkyl group, Y is oxygen or >NR and R is hydrogen or alkyl. These compounds can be prepared by a free radical catalyzed addition of a perfluoroalkyl iodide to a 5norbornene diacid or its derivative. They are useful as surfactants.
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 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 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.