Expired Canadian patentCanada
Process for improving the recovery of fibres and fillers from the waste liquors of paper machines
CA 738308 A · Owner: Farbenfabriken Bayer Aktiengesellschaft · Inventors: Wolfgang Lehmann; Hermann Tretter
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 July 12, 1966. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 12, 1983.
- 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 12, 1966
Term endedJuly 12, 1983
Patent numberCA 738308 A
Classification (IPC)C02F1/56
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.