Phthalocyanine treatment process
CA 1284494 C · Owner: Hor, Ah-Mee · Inventors: Toth, Alan E. John; Liebermann, George; Hor, Ah-Mee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described for preparing vanadyl phthalocyanine for electrophotographic devices comprising reacting vanadium pentoxide and phthalonitrile to form vanadyl phthalocyanine pigment and other reaction products, separating crude vanadyl phthalocyanine pigment from the other reaction products, washing the crude vanadyl phthalocyanine pigment drying the, crude vanadyl phthalocyanine pigment mixing the crude vanadyl phthalocyanine pigment with a solution of between about 60 percent and about 80 percent by weight of H2SO4 to form a H2SO4-vanadyl phthalocyanine pigment mixture dilutingthe H2SO4-vanadyl phthalocyanine pigment mixture with deionized water to form a diluted mixture, …
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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
- Granted May 28, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2008.
- 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.