Process for producing a neutral paper
CA 1301413 C · Owner: Sakabe, Takao · Inventors: Miyamura, Takao; Suzuki, Hiroshi; Sakabe, Takao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title of The Invention, Process for producing a neutral paper Abstract of The Invention, This invention provides a process capable of obtaining a sufficiently higher retention of fiber and filler and simultaneously an improved drainage in neutral paper-making system, especially in the neutral wood containing papermaking system which contains a large majority or high yield pulp. This invention relates to a process for producing a neutral paper which comprises adding a cationized starch bentonite, and colloidal silica to a stock slurry consisting of filler and the pulp-stuff containing a high yield pulp in an amount ranging from zero to 100 weight percents to make paper in a neutral pH range.
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 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.