Electrostatic roller transfer of toned images from a photoconductor member to a sheet substrate
CA 2078868 C · Owner: Compaq Computer Corporation · Inventors: Bhagat, Gopal C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrically biased attracter roller (60) is utilized in an electrophotographic image reproduction machine (10a), in place of a conventional corotron device to electrically transfer toner from the side of a rotating photoconductor drum (14a) onto a side surface of paper stock (36a) being operatively fed through the machine. The charged roller (60) is, spring-biased into forcible side-to-side engagement with the drum (14a) and is, frictionally rotated by the drum. The paper stock (36a) is fed between the rotating roller (60) and drum (14a) and, by a, combination of pressure and electrical attractive force, the roller (60) very efficiently transfers toner from the drum (14a) to the paper. …
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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 January 30, 1992 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 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.