Process for manufacturing a water-disintegrable sheet
CA 2208759 C · Owner: Takeuchi, Naohito · Inventors: Okubo, Toshiya; Monobe, Masanori; Okuda, Toshiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process to improve wet tensile strength as well as water-swelling property of a water-disintegrable sheet to be used as a wet wipe for cleaning in household. A mixture of water-swelling or water-insoluble carboxymethyl cellulose and/or salt thereof having a degree of substitution - 0.30 - 0.60 and pH >= 5.0 and waterdispersible fibers is subjected to a foliating step of a process to obtain the water-disintegrable sheet and before, or after the foliating step of the process the mixture is, added with a base.
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
- Filed November 1, 1996 and granted March 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 1, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 2018.
- 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.