Thermally-responsive record material
CA 1309865 C · Owner: Bartman, Gerald C. · Inventors: Bartman, Gerald C.; Glanz, Kenneth D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel thermally-responsive record material is disclosed which is resistant to image fade from one or more common external challenges including contact with common fats or oils skin oil, carbonless solvents, plasticizers or high heat and humidity such as in a 90°F/90% humidity, test. The heat-sensitive material of the invention contains a fade resistance imparting ascorbic acid ester of the formula wherein R1 is hydrogen or a straight chain or branched chain acyl group of from 9 to 22 carbons inclusive wherein R2 is a straight chain or branched chain alkyl group of from 8 to 21 carbons inclusive;, 5009F
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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 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 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.