Eva polymers for use as beater saturants
CA 2038868 C · Owner: Mudge, Paul R. · Inventors: Nass, David R.; Mudge, Paul R.; Walker, James L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A beater saturation process for forming a nonwoven wet laid composite is provided which comprises the following steps: (I) providing an aqueous dispersion comprising: (a) 10 to 95% by weight of a water-dispersible but water-insoluble fiber;, (b) 0 to 80% by weight of a finely divided substantially water-insoluble, non-fibrous inorganic filler;, (c) 5 to 50% by weight of an anionically charged emulsion polymer comprising 70 to 90% by weight of a vinyl ester of an alkanoic acid; 10 to 30% by weight ethylene, 0 to 70% by weight of a C2-C8 alkyl acrylate and 0 to 4% by, weight of an anionic functional monomer (II) colloidally destabilizing the resulting mixture to form a fibrous agglomerate in …
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 March 22, 1991 and granted July 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2013.
- 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.