Method for monitoring prepaid stamps on mail
CA 2437909 A1 · Owner: Diefenbach, Jorg · Inventors: Denzer, Rudi; Diefenbach, Jorg; Vullriede, Garsten
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The inventive method is characterized in that the prepaid stamps are checked to see if they contain a predefined security feature. If they do not the , inventive method checks if at least one selected read area of the mail contains a predefined graphic representation of a prepaid stamp.
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 January 25, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2024.
- 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.