Process of preparing size
CA 1083759 A · Owner: Sca Development Aktiebolag · Inventors: Calmell, Rolf M.; Karlsson, Alf H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing size for the treatment of paper is disclosed, comprising providing a fatty acid either, saturated or unsaturated, and at least partially saponifying the fatty acid by contacting it with an alkali metal hydroxide in the presence of aluminum or zinc. In addition methods, for preparing sized paper are disclosed including providing, a fatty acid, at least partially saponifying the fatty acid by contacting with an alkali metal hydroxide in the presence of aluminum or zinc, preparing an aqueous solution of the saponified fatty acid, and applying the aqueous solution of the at least partially saponified fatty acid to fibrous materials prior to formation of a paper web …
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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 August 19, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 19, 1997.
- 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.