Processing of printing plates
CA 1061154 A · Owner: Vickers Limited · Inventors: Watkinson, Leonard J.; Lawson, Leslie E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photopolymer layer which has been image wise exposed is processed by contacting the layer with a developer comprising a lactam to selectively remove the non-light struck areas of the layer. The developer may additionally include an acid, a wetting agent an inert, diluent and/or a conventional developer for the image-wise exposed polymer. Examples of preferred lactams are 1-methyl-2-pyrrolidinone, 1-butyl-2-pyrrolidinone 1-cyclohexyl-2-pyrrolidinone, 2-pyrrolidinone 1-vinyl-2-, pyrrolidinone and .epsilon.-caprolactam. The developer is particularly useful for developing image-wise exposed photopolymer layers in the photomechanical production of lithographic printing plates.
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 August 28, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 28, 1996.
- 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.