Polyurethane elastomers comprising a charge-control agent and shaped elements therefrom
CA 1296020 C · Owner: Chen, Tsang Jan · Inventors: Upson, Donald Allen; Chen, Tsang Jan; Yacobucci, Paul Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Herein are disclosed charge-control agents of the formula:, : , ;, ; or , These charge-control agents are incorporated into polyurethane elastomers which in turn are used to make shaped articles such as electrically biasable parts for use in electrophotographic copying equipment.
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
- Granted February 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 18, 2009.
- 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.