Construction of a photosensitive drum
CA 1069578 A · Owner: Ricoh Company · Inventors: Nagatsuna, Shinzi; Hayashi, Toshio; Ikeda, Sunao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photosensitive drum for use in electrophotographic apparatus of wet developing type comprising an excess developing solution removal roller which is juxtaposed to the drum with a given spacing by act of a pair of bearing rollers being in rolling contact with lateral edge portions of the peripheral durm surface. The above edge portions are coated with a layer or film of a material such as alumite, stainless steel, etc. for abrasion preventing purpose to thereby preserve the operation of the removal roller. - 1 -
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
- Granted January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.