Method for integrating hidden information in a set of notes
CA 2405948 A1 · Owner: Busch, Christoph · Inventors: Rademer, Ero; Busch, Christoph; Wolthusen, Stephen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for integrating hidden information in a set of notes. According to the method, the geometrical shape and/or the mutual geometrical proportion of geometrical elements of the set of notes are modified relatively to the original version based on a predetermined key, so , that the modifications carry the information to be integrated in digital form and do not reduce the readability of the set of notes. The inventive method allows especially for the integration of an identification marking in a set of notes and the retention of said marking when the set of notes is subjected to copying or to simple manipulations.
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 April 4, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 4, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 2023.
- 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.