Novel crystal modification of c.i. pigment red 53:2 (gamma-phase)
CA 2275374 A1 · Owner: Clariant Gmbh · Inventors: Schmidt, Martin Ulrich; Metz, Hans Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel crystal modification of C.I. Pigment Red 53:2 (gamma-phase) The invention relates to a novel crystal modification (.gamma.-modification) of C.I. Pigment, Red 53:2 of the formula (1) (see formula I), having the following characteristic reflections in the X-ray powder diffraction pattern:, 2.THETA. d Relative intensity in % 4.4 20.2 49, 5.8 15.4 100, 8.8 10.0 23 10.3 8.6 25, 10.9 8.1 33, 12.2 7.3 15, 13.9 6.4 16 15.4 5.8 15 , 16.7 5.3 28, 17.6 5.0 16 18.4 4.8 18, 18.6 4.8 18, 19.7 4.5 20, 20.8 4.3 18 23.2 3.8 48, 24.0 3.7 21, 24.8 3.6 37, 25.2 3.5 34 26.6 3.3 19, 27.3 3.3 19, 27.9 3.2 12, 29.3 3.0 14
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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 18, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 18, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2021.
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Timeline
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.