Preparation of receiver sheet materials for peel developable, single sheet color proofing system
CA 2000375 A1 · Owner: Hoechst Celanese Corporation · Inventors: Platzer, Stephan J. W.; Hannigan, Timothy T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to positive-working photopolymerizable, containing sheet constructions which upon exposure to an actinic, radiation source through a screened image can accurately, reproduce said image on conventional paper with an adhesive layer pretreatment. The construction is useful as a peel apart color proofing film which can be employed to accurately predict the image quality from a lithographic printing process.
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 October 10, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2011.
- 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.