Communications signal
CA 2057617 C · Owner: Alcatel N.V. · Inventors: Wedding, Berthold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a transmitter including a carrier source (TQ) an input signal (a) is present which contains the information to be transmitted and is composed of signal components (a1) having amplitudes less than a predetermined threshold value (U0) or equal to the threshold value (U0) and signal components (a2) whose amplitudes are less than the threshold value (U0) or equal to the threshold value (U0). For the purpose of identification, the two signal components (a1 a2), are sampled in different ways, for example at different frequencies (f1, f2), and are combined into a modulation signal (f) in such a manner that the two signal components have the same sign. In a receiver (E), a circuit arrangement is …
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 December 13, 1991 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2013.
- 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.