Use of surfactants in paste printing ink
CA 2180057 C · Owner: Sharma, Sandeep · Inventors: Sharma, Sandeep
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a paste printing ink containing a suitable solvent a hard resin, pigment and other typical additives the improvement, comprising the addition of a small amount of a surfactant to the printing ink to enable the ink to be water washable on clean-up. The invention is also directed to a method for cleaning the printing apparatus with an aqueous cleaning solution, the method comprises utilizing a conventional printing ink to which a small amount of surfactant has been added in combination with an acidic fountain solution and washing the printing apparatus with a aqueous washing solution at a pH of between about 8.5 and 13.5, the washing solution containing …
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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 June 27, 1996 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2018.
- 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.