Electrophotographic apparatus
CA 1103745 A · Owner: Tokyo Shibaura Electric Co. Ltd. · Inventors: Baba, Mamoru; Koyama, Mitsuaki; Inoue, Tetsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrophotographic apparatus includes a photoconductive drum capable of rotating at least two rotations during a series of copying processes, a first charging device for charging the surface of the drum in a negative polarity, a first exposing device a, development device having a magnetic brush unit and a second, charging device for transferring image. A second exposing device is provided to expose the entire surface of the photoconductive drum together with the residual toner after the image transfer process during the second rotation of the photoconductive drum. A third charging device is provided to supply positive charges to the surface of the drum and the residual toner after the …
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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 June 23, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 23, 1998.
- 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.