Absorbent products and their manufacture
CA 2016395 C · Owner: Allied Colloids Limited · Inventors: Allen, Adrian S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water soluble, substantially linear, polymer is made by copolymerisation of a water soluble blend of monoethylenically unsaturated monomers comprising carboxylic acid monomers such as acrylic acid and a hydroxylic monomer of the formula CHR1=CR2-Y-M a-OH where R1 is hydrogen or carboxy, R2 is hydrogen carboxy or, methyl, Y is O, CH2O or COO M is alkyleneoxy and a is at, least 5. This polymer can be cross linked generally, after being shaped by extrusion or other shaping of an aqueous solution of the polymer, to form cross linkages between the carboxyl and hydroxyl groups. The shaped elements can have high eater absorbency and can be in the form of, for instance, fibres or films.
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 May 9, 1990 and granted October 3, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2012.
- 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.