Power amplifying means for r.f. signals
CA 2061135 A1 · Owner: Pike, Tudor D. · Inventors: Pike, Tudor D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Power Amplifying means for r.f. Signals A known pulse width modulator transmitter amplifies a constant amplitude r.f. signal from drive 7 in dependence on the level of supply voltage to the power amplifier 2 which in turn depends on the amplitude of an audio input which controls a pulse width modulator 1. However the transmitter is convertible to a single side band mode because a signal derived from the envelope of an amplitude modulated drive waveform from drive 7 is predistorted in compensation network 9 and so controls the pulse width modulator 1 as to maintain the supply voltage of the power amplifier, now operating in a linear mode substantially, constant despite the now varying input …
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 February 13, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2014.
- 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.