Electrophotographic printing system
CA 2059768 A1 · Owner: Bhagat, Gopal Chhangomal · Inventors: Bhagat, Gopal Chhangomal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for developing an image on a photoconductive surface. The apparatus includes a roller positioned adjacent to the photoconductive surface. Negatively charged toner is supplied to the surface of the first roller where the toner electrostatically adheres, either in a uniform layer or a variable layer, to the surface of the first roller. The negatively charged toner electrostatically adhered to the surface of the first roller is then transferred to the photoconductive surface. The apparatus may also include a second roller held at a positive charge relative to the first roller for electrostatically transferring toner from the second roller to the first roller. Alternately the …
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 21, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 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.