Erasable printing form
CA 2108862 C · Owner: Hirt, Alfred · Inventors: Hirt, Alfred; WEIß, ROBERT; Nussel, Barbara
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing an erasable printing form by making the outer layer of the printing form from a material containing strong micro-dipoles preferably a ferroelectric, material, in particular a ferroelectric ceramic. In wet offset printing the non-printing areas, of the printing form are rendered hydrophilic by a hydrophilizing agent and they are maintained during the entire printing process. Plate cleaners can for example, be used as, the hydrophilizing agents. The printing form can be erased by a non-polar solvent and can be reused again by rendering the non-printing areas hydrophilic again.
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 20, 1993 and granted December 8, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 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.