Expired Canadian patentCanada
Process for the catalytic hydrogenation of hydrocarbon oils or oil fractions and a catalyst therefor
CA 935775 A · Owner: Shell Internationale Research Maatschappij, N.V. · Inventors: Willem C. J. Quik
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 October 23, 1973. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 23, 1990.
- 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—
GrantedOctober 23, 1973
Term endedOctober 23, 1990
Patent numberCA 935775 A
Classification (IPC)C10G65/08 +2 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.