Expired Canadian patentCanada
Pulping process
CA 1250704 A · Owner: Fishlock-Lomax, Eric G. · Inventors: Fishlock-Lomax, Eric G.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of wood-pulp is described in which one or more amphoteric surfactants are included in the cooking liquor to reduce the cooking time.
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 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 7, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 19, 1985
GrantedMarch 7, 1989
Term endedMarch 7, 2006
Patent numberCA 1250704 A
Classification (IPC)D21C3/00 +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.