Etch inhibitors in developer for lithographic printing plates
CA 2249647 A1 · Owner: Eckler, Paul E. · Inventors: Eckler, Paul E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A developer composition for photosensitive elements including lithographic printing plates color proofing films, positive and negative working lithographic plates and thermally sensitive plates giving high image contrast and reduced oxide attack to image surfaces said composition comprises: a source of hydroxyl ions sufficient to provide said developer composition to have a pH of from about 10 to about 14; an optional buffer; an etch inhibiting additive and, sufficient water to produce a developer composition. A method for forming an image also is disclosed.
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 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2020.
- 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.