Method and apparatus for recording usage data of card operated devices
CA 2128355 C · Owner: Koninklijke Kpn N.V. · Inventors: Van De Pavert, Hendricus Johannes Wilhelmus Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method for recording usage data of a card operated device such as a public telephone set or a vending machine said method comprising the storage of said usage data in a storage unit associated with saiddevice. The usage data being stored in said storage unit have first been transferred from said device to said card and subsequently from said card to said device. The security of the data transfers may be enhanced by cryptographic techniques. Preferably transmission of said usage data from said card to said storage unit takes place during a verification procedure by means of which the authenticity of said card is checked.
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 July 19, 1994 and granted September 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 19, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 19, 2016.
- 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.