Magnetic toner and process for producing magnetic toner
CA 2071457 C · Owner: Shimamura, Masayoshi · Inventors: Mikuriya, Yushi; Kobayashi, Kuniko; Nakahara, Toshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic toner which is excellent in the low temperature fixability and the anti-offset properties is disclosed. The binder resin of the tong comprises a non-crosslinked styrene polymer, a non-crosslinked styrene copolymer or a mixture of these and a, polyolefin, wherein;, the binder resin has in its molecular weight, distribution pattern measured by gel permeation chromatography (GPC), at least one maximal point (peak) in each region of a low molecular weight of from 5,000 to 20,000 and of a high molecular weight of from 200,000 to 1,000,000, where a height H1 of a maximum peak in the low molecular weight region a, height H3 of a maximum peak in the high molecular weight region and a …
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 June 17, 1992 and granted September 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 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.