Thermochromic jet ink
CA 1319795 C · Owner: Marconi Data Systems Inc. · Inventors: Lent, Bruce A.; Elue, Paul N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The composition is suitable for ink jet printing operations and comprises a combination of at least one heat-resistant and at least one heat-sensitive dye. The heat sensitive dye is one capable of undergoing decomposition upon exposure to an elevated temperature for a period of time so that the color of` the ink changes to that of the heat resistant dye. The compositions are particularly useful as sterilization and/or thermal exposure indicators.
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 July 6, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 6, 2010.
- 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.