Distance division multiplexing
CA 2575981 C · Owner: Guruprasad, Venkata · Inventors: Guruprasad, Venkata
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
General method for extracting an electromagnetic or other wave-propagated signal of a desired source from the overall received waveform containing the sum of signals from a multiple of such sources comprising the steps of first expanding the spectrum of the received sum of signals in proportion to their source distance so as to spectrally isolate the signal from the desired source, selecting the signal spectrum and spectrally compressing the selected signal back to its original band of frequencies. The distance dependent expansion is performed by scanning the space gradient of the signal spectrum.
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 June 15, 2005 and granted October 29, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 15, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.