Vesicular recording material containing a sulphone or sulphonamide derivative in the thermoplastic vehicle
CA 1136473 A · Owner: Bexford Limited · Inventors: Rennison, Stuart C.; Stacey, Ronald J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Recording materials. The plastics vehicle of a vesicular recording material includes a defined sulphone and/or sulphonamide additive in an amount of l to 100% by weight based upon the weight of a polymeric component of the plastics vehicle. The additive provides improved image density and a black-appearing image.
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 November 30, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 1999.
- 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.