Pressure sensitive record material
CA 1311124 C · Owner: Doman, Tracey A. · Inventors: Doman, Tracey A.; Cooper, John B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Acid sized carbonless base paper incorporating a sulphate based filler, particularly calcium sulphate is less base, reactive than otherwise similar paper made using conventional clay (kaolin) fillers. Carbonless paper particularly CB paper, made from such base is less susceptible to undesired discolouration arising from base reactivity.
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 December 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 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.