Method and apparatus for securing data communication
CA 2196784 C · Owner: Smart Tone, Inc. · Inventors: Mark, Andrew R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An auto-dialer (100) suitable for use as a smart card capable of being acoustically coupled to a telephone (122) and being reprogrammed in response to acoustic signals. The auto-dialer is comprised of a dual tone multifrequency (DTMF) encoder (110), a DTMF decoder (112) a microprocessor (104), an input device (105) a read only memory (ROM) (106), a random access memory (RAM) (108) and a speaker/microphone (114). The programming and other features of the auto-dialer (100) can be enabled or disabled by the auto-dialer (100) in response to persecuted signals comprising a string of DTMF tones. Alternatively, the housing for the auto-dialer can be configure as having a generally saucer …
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 August 7, 1995 and granted June 6, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 2017.
- 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.