Systems and methods for generating tones for operating telephones
CA 2401471 C · Owner: August, Chris · Inventors: Schneider, Mathieu; Sternberg, Thomas Heinrich; August, Clifford J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for generating number tones for dialing a telephone device comprising a microphone. The system comprises a housing a first data entry , device , first and second memory devices an output signal generator, and a transducer. The , housing defines a sound opening. The first data entry device is supported by the , housing and is associated with a first sequence of stored digits. The first memory , device stores the first sequence of stored digits. The second memory device stores , frequency data associated with number tones The output signal generator generates, upon activation of the first data entry device an output signal based on the , first sequence of stored digits and the …
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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 September 4, 2002 and granted March 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 4, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 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
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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.