Dye solvents for pressure - sensitive copying systems
CA 1103023 A · Owner: Sears, James K. · Inventors: Sears, James K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Solvents useful to dissolve dyes employed in pressure-sensitive copying systems comprise aryl esters of benzoic or substituted benzoic acid having the structure:, wherein R1 is hydrogen, methyl or ethyl; R2 is hydrogen or C1 to C9 alkyl; R3 is hydrogen, methyl or ethyl; and n is zero or 1. - 1 -
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 June 16, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 1998.
- 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.