Helical gears for a process cartridge
CA 2088237 C · Owner: Nishibata, Atsushi · Inventors: Nishibata, Atsushi; Tsuda, Tadayuki; Watanabe, Kazushi
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 an image forming apparatus has a cylindrical member with a photosensitive layer thereon; a first gear provided at one end of said cylindrical member in an axial direction thereof; and a helical gear as a second gear provided at said one end of said cylindrical member adjacent to and outside of said first gear in the axial direction of said cylindrical member, said helical gear having a diameter larger than a diameter of said first gear. The helical gear meshes with a drive gear provided in a main body of the image forming apparatus to receive the drive force of a motor provided in the main body for rotating said photosensitive drum when said photosensitive …
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 January 27, 1993 and granted June 5, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2015.
- 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.