System and method for transmission of bursts of digital information
CA 2094052 C · Owner: He Holdings, Inc. · Inventors: Critchlow, David N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mobile station cellular telephone transmitting system having a digital data source, waveform map FIR filter with eight, taps, a zero force circuit start/end burst detection circuit, quadrature modulator upconverter, and power amplifier. The, ramping of the power output at the beginning and end of each frame slot or burst is controlled by forcing the first and last symbol of the burst's FIR filter output to zero.
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 April 15, 1993 and granted November 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2015.
- 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.