Expired Canadian patentCanada
Paper making process
CA 1329312 C · Owner: Bixler, Harris J. · Inventors: Peats, Stephen; Bixler, Harris J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Addition of smectite and a cationic starch to the furnish in a paper making operation improves the retention of filler material and the quality of the paper.
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 May 10, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 10, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 23, 1989
GrantedMay 10, 1994
Term endedMay 10, 2011
Patent numberCA 1329312 C
Classification (IPC)D21H17/29 +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.