Coupling process
CA 2075608 A1 · Owner: Tuck, Brian · Inventors: Tuck, Brian; Mordente, Alison H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case P-18751/A/MA 2038, Abstract of the Disclosure Coupling Process, A process for the production of a diarylide pigment comprising a) coupling a tetrazo component with substantially the stoichiometric proportion of one or more coupling components; b) in the pigment reaction mixture so obtained coupling a tetrazo component with substantially the stoichiometric proportion required of one or more coupling components provided that the total number of, coupling components used in steps a) and b) is at least three; and c) subjectingthe pigment so obtained to an after-treatment.
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 August 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 2014.
- 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.