Electrophotographic photosensitive material
CA 2083422 C · Owner: Nec Corporation · Inventors: Matsui, Naoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrophotographic photosensitive material is here disclosed which comprises a conductive substrate and, at least an undercoat layer, a charge generating layer and a charge transfer layer formed on the conductive substrate the electrophotographic photosensitive material being characterized in that a binding resin contained in the charge transfer layer comprises two or more kinds of polycarbonate resins having different average molecular weights. The polycarbonate resins are preferably of a bisphenol Z type. Furthermore, a solvent for a coating material which is used to form the charge transfer layer is preferably a chlorine-based solvent. The electrophotographic photosensitive material …
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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 November 20, 1992 and granted June 25, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 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.