Expired Canadian patentCanada
Coumarino-3,4-oxazoles
CA 1058176 A · Owner: Ciba-Geigy Ag · Inventors: Meyer, Hans R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides new coumarino-3,4-oxazoles. The novel compounds are suitable optical brighteners for high molecular organic materials, especially for polyesters polyvinyl chloride and polyacryl nitrile.
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 July 10, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 10, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJuly 10, 1979
Term endedJuly 10, 1996
Patent numberCA 1058176 A
Classification (IPC)C09B23/10 +1 more
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.