Security printing of articles
CA 2312642 A1 · Owner: Benson, Victor · Inventors: Benson, Victor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a security printing system involving the use of thermochromic inks printed on an article such ae a lottery ticket or pre-paid telephone card having an amount of credit thereon for use in a mobile telecommunications network. Two layers of thermochromic ink are applied to the article each having a different and sufficiently separate activation temperatures at which a certain characteristic of the ink changes, for example its colour opacity, transparency or translucency. The first applied layer in the shape of, a validation mark or the like ideally has an activation temperature, higher than the second layer applied thereover so that two separate, tests can be performed on …
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 June 28, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2022.
- 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.