Toner and developer compositions containing polyesters
CA 2006508 C · Owner: Marchessault, Robert H. · Inventors: Bluhm, Terry L.; Fuller, Timothy J.; Marchessault, Robert H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A toner composition comprised of semicrystalline polyester resin particles, especially polyhydroxyalkanoates copolymers thereof, or blends, and pigment particles. Processes for the preparation of the semicrystalline polyester resins by ring opening polymerization of a monomer in the presence of a catalyst is also illustrated.
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 December 22, 1989 and granted March 26, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 22, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2011.
- 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.