Portable telephone
CA 2070027 C · Owner: Toba, Hiroyuki · Inventors: Toba, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A modulated signal, sent from the base station for controlling the transmission power is demodulated to reproduce a first data unit representing the class of receive field intensity at the base station and at the, same time, the modulated signal is envelope-detected to generate a second data unit representing the receive field intensity of the modulated signal. The classes corresponding to the first data unit are subdivided according to the second data unit, and a control voltage corresponding to a subclass is generated. The amperage of the source current to the transmission amplifier is controlled with that control voltage, and the transmission power is thereby controlled.
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 29, 1992 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 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.