Electrophotographic photoreceptor
CA 2067524 A1 · Owner: Murayama, Tetsuo · Inventors: Watabe, Sumiko; Saita, Atsuo; Ono, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrophotographic photoreceptor comprising an electrically conductive support and a photosensitive layer formed thereon, wherein said photosensitive layer contains at least one member selected from the group consisting of hydrazone compounds of the formulas (I) (II) and (III):, (I), (II), , (III), wherein X is a hydrogen atom or a group of the formula (IV):, -C(R8)=N-Q2 (IV), Q1 is a group of the formula (V) (VI), (VII), (VIII) or, (IX); Q2 is a group of the formula (VI) (VII), (VIII), (IX) or (X); each of Q3 and Q4 which may be the same or different, is a group of the formula (VI) (VII), (VIII), (IX) or (XI):, , (V) , (VI) (VII), , (VIII), (IX), (X), (XI), Y is a bivalent hydrocarbon …
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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 April 29, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 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.