Pigment yellow 74 and printing ink composition
CA 2413341 A1 · Owner: Shiromaru, Osamu · Inventors: Ishigami, Takayoshi; Kawashima, Yoshinori; Oshiba, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pigment yellow 74 obtained by coupling a coupler component containing 2-methoxyacetoacetoanilide and an acetoacetoanilide derivative of the following formula (1) in an amount of 0.1 to 10 mol %, based on the 2methoxyacetoacetoanilide, and a diazo component obtained by diazotizing 2-methoxy-4-nitroaniline, (see formula 1) wherein X may be the same or different and is CONR1R2 SO2NR1R2, NHCOR1, CONH(CH2)K NR1R2 or SO2NH(CH2)K NR1R2 (in which each of R1 and R2 is independently a hydrogen atom or an alkyl group, or R1 and R2 together form a cyclic structure and k is, an integer of 1 to 4), m is 1 or 2 Y may be the same or different, and is R3 OR3 (in which R3 is a hydrogen atom or an alkyl …
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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 December 2, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 2, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 2024.
- 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.