Transfer roller and toner for electrophotographic apparatus
CA 2105253 C · Owner: Katagata, Satoshi · Inventors: Sakai, Chinobu; Okano, Yoshiaki; Satou, Kouichirou
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transfer roller used in a transfer device for an electrophotographic apparatus using a toner comprises a sponge layer, a resistor layer formed on an outer surface of the sponge layer, and a binder layer located between, the sponge layer and the resistor layer for adhering the, sponge layer and resistor layer when heated to a predetermined temperature. The sponge layer is formed of a material having an endothermic point at a temperature not more than the predetermined temperature for heating the binder layer. Preferably, the roller comprises a sponge layer having a hardness of 40 degrees or less in ASKER-C hardness, and the resistor layer formed on an outer surface of the sponge layer has …
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 August 31, 1993 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 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.