Photopolymerizable printing plate for flexographic printing
CA 2047302 A1 · Owner: E. I. Du Pont De Nemours And Company · Inventors: Schumacher, Wilfried; Abele, Werner; Schober, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photopolymerizable printing element comprising a photopolymerizable layer and an elastomeric layer wherein the elastomeric layer contains as a binder, one, or more thermoplastic elastomeric block copolymers made, up of at least one polystyrene block and at least one polybutadiene, polyethylene, and/or polypropylene block. The polystyrene content of the binder or binder mixture is 10 to 35 percent by weight, the solution viscosity of the block copolymers for a 5.23% solution in toluene is greater than or equal to 5 mm2/s and the melt index measured according to ASTM D 1238 P is less than or equal to 10 g/10 min.
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 July 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 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.