Active prevention of radio frequency emissions from a mobile communications unit in restricted areas
CA 2275649 A1 · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Dahlkvist, Mikael; Liljegren, L. Fredrik; Bjorkengren, Ulf C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To enable use of an intelligent mobile communication unit (1) in areas where there are restrictions on the emission of radio frequency the unit comprises , a removable antenna (2) and a switch which is adapted to switch off the power to at least the radio frequency emitting part of the unit upon removal of the antenna, thereby actively preventing radio frequency radiation from the unit even if non-radio frequency energy emitting parts of the unit (1) are operable.
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 December 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2019.
- 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.