Electrophotographic photoreceptor and method for preparation thereof
CA 2081175 A1 · Owner: Aso, Ryoko · Inventors: Umehara, Tadashi; Kawai, Michio; Aso, Ryoko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A novel electrophotographic photoreceptor and a method of preparation thereof are disclosed. The photoreceptor is characterized in that the photosensitive layer contain a specific carbonate resin binder resin having a weight average molecular weight on not less than 200,000. The resin is preferably a polycarbonate resin which contains repeating units represented by the formula, (I), wherein R1, R2, R3, R4, R5 R6, R7 and R8 are respec-, tively and independently a hydrogen atom a lower alkyl, group, a halogen atom or an unsubstituted or substituted aromatic group; and R9 and R10 are respectively and independently a hydrogen atom, a lower alkyl group an, …
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 October 22, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 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.