Magnetic document validator
CA 2048632 A1 · Owner: Bryce, David R. · Inventors: Bryce, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of and apparatus for determining the genuineness of a document (22) such as a currency note printed at least in part with magnetizable ink in which there is produced a first signal (Msat) as a measure of the saturation magnetization of a portion of the document printed with the ink and a second signal (Mrem) as a measure of the remanent magnetization of said portion and in which the ratio of the second signal (Mrem) to the first signal (Msat) is determined as a measure of genuineness of the document.
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 December 24, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 24, 2012.
- 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.