High cohesion waterborne pressure sensitive adhesives
CA 2105837 A1 · Owner: Petriw, Gerhard · Inventors: Sarkis, Michael T.; Mudge, Paul R.; Petriw, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Waterborne pressure sensitive adhesive multipolymers exhibiting very high cohesive strength may be prepared by a two stage emulsion polymerization procedure (overpolymerization) in which the first stage is a low Tg (i.e. less than about -20°C) copolymer having good adhesive properties and the second stage, is a high Tg (i.e. greater than about +25°C) non-pressure sensitive homopolymer or copolymer and wherein the ratio of the first stage to the second stage are between 80 to 20 and 99 to 1.
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 September 9, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 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.