Water developable lithographic printing plate having dual photosensitive layering
CA 1103089 A · Owner: Polychrome Corporation · Inventors: Chu, Simon L.; Wilkes, Alan L.; Golda, Eugene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a method for producing a water developable lithographic printing plate which comprises treating at least one surface of a metal sheet substrate with a layer of a lithographically suitable light, sensitive, water soluble substance and subsequently coating the thus treated base sheet with an upper layer of a water-insoluble ink receptive, litho-, graphically suitable photosensitive composition. The photosensitive layers must be either both positive working or both negative working. The photosensitive composition is either water-permeable before exposure to actinic radiation and becomes water-impermeable upon exposure to actinic radiation or it is water-impermeable before …
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
- Granted June 16, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 1998.
- 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.