Closed loop magnetic brush development system
CA 2055971 A1 · Owner: Compaq Computer Corporation · Inventors: Bhagat, Gopal Chhangomal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A printing machine, such as a copier or a printer is, provided with an electrophotographic engine cartridge including a toner castridge, a rotatable photoconductor drum and a, specially designed magnetic brush development module. The development module utilizes a rotating magnetic roller disposed, in a developer sump, to transport a toner carrier delveloper material toward a side surface portion of the rotating drum onto which the toner position of the transported developer is electrically transferred. The development module is operated in a unique closed loop fashion by the action of a specially designed blade member which strips away the toner-depleted developer from the roller and causes …
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 November 21, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2013.
- 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.