Thermally-responsive record material
CA 2056277 C · Owner: Bartman, Gerald C. · Inventors: Vervacke, Steven L.; Bartman, Gerald C.; Sands, Peggy D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved heat-sensitive recording material is disclosed comprising a substrate, a binder a chromogenic, material, an electron-accepting color developer which reacts with said chromogenic material to form a color and a color-, stabilizing resin. The color stabilizing resin comprises an addition product of a diolefinic alkylated or alkenylated cyclic hydrocarbon or, an addition product of a phenol and a diolefinic alkylated or alkenylated cyclic hydrocarbon. The colorstabilizing resin, dye, and developer, have a weight percent resin phenolic group of about 5 or less. The heat-sensitive recording material has a fade index greater than 45. Imaged recording materials according to the …
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 November 27, 1991 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2013.
- 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.