Electrophotographic image forming apparatus, process cartridge, developing device and measuring part
CA 2285157 C · Owner: Sakata, Shirou · Inventors: Karakama, Toshiyuki; Sakata, Shirou; Matsumoto, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process cartridge detachably mountable to an electrophotographic image forming apparatus said, process cartridge includes (a) an electrophotographic photosensitive member; (b) process means actable on the electrophotographic photosensitive member; (c) a measuring electrode member having input side and output side electrodes having at least one juxtaposed portions, the measuring electrode member being disposed at such a position that it is contacted to a developer; (d) a reference electrode member having input side and output side electrodes having at least one juxtaposed portions, the reference electrode member being disposed at such a position that it is out of contact to the developer; …
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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 October 6, 1999 and granted July 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 6, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2021.
- 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.