Portable handsets
CA 2022958 A1 · Owner: Ferranti Creditphone Limited · Inventors: Greenwood, Martin; Greenwood, Martin; Boothman, Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Title: Portable Handsets A portable handset includes a burst mode radio transmitter/receiver unit having an antenna (14). The handset carries a screening plate (16) to screen a user's hearing aid (20) from the radio frequency power produced by the antenna (14) of the unit.
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 August 9, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2012.
- 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.