Dual mode mobile telephone
CA 2306485 A1 · Owner: Siemens Aktiengesellschaft · Inventors: Pillekamp, Klaus-Dieter; Sydon, Uwe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mobile telephone, as well as a radio transmission process are particularly , suitable for so-called dual use appliances. The mobile telephone has a first transmitter/receiver (3) for transmitting/receiving mobile radio signals in a time multiplex frame of a duration t1 with a number of time slots of a duration t2 in a first frequency range and a second transmitter/receiver (4) for transmitting/receiving signals in a second frequency range. A converter (2) converts the signals received by the second H.F. unit (4) in reception time slots of a time multiplex frame into useful signals and useful signals , for transmission in transmission time slots of a time multiplex frame by means of …
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 September 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 2020.
- 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.