Process for imparting wet strength to paper
CA 2093289 A1 · Owner: Konig, Joachim · Inventors: Traeubel, Harro; Laas, Hans-Josef; Faika, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for imparting wet strength to paper Abstract of the Disclosure, The novel AOX-free process for imparting wet strength to paper with water dispersible polyisocyanates is distinguished by a good wet-strength effect even under, mild drying conditions, and does not affect the activity of optical brighteners used at the same 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
- Filed April 2, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2015.
- 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.