Improved in-band signaling for data communications over digital wireless telecommunications networks
CA 2401939 C · Owner: Leyendecker, Robert · Inventors: Leyendecker, Robert; Proctor, Rod L.; Preston, Dan A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inband signaling modem communicates digital data over a voice channel of awireless telecommunications network. An input receives digital data. An encoder converts thedigital data into audio tones that synthesize frequency characteristics of human speech.Thedigital data is also encoded to prevent voice encoding circuitry in the telecommunicationsnetwork from corrupting the synthesized audio tones representing the digital data. An outputthen outputs the synthesized audio tones to a voice channel of a digital wirelesstelecommunications network.
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 May 15, 2000 and granted June 21, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 15, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 15, 2022.
- 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.