Relay receiver
CA 2003207 C · Owner: Fujitsu Limited · Inventors: Seki, Junji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A relay receiver performs a heterodyne relay operation by using a receiving frequency converting portion an intermediate, frequency amplifying portion and an automatic gain controller. The variable band limiting portion limits an amplified signal output from the intermediate frequency amplifying portion to a band corresponding to the state of a band control signal thereby, transmitting an amplified signal. The band control portion is responsive to an automatic gain control signal outputted from the automatic gain controller, and outputs to the variable band limiting portion a band control signal for enabling the variable band limiting portion to limit the amplified signal to a narrow band …
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 November 17, 1989 and granted July 12, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2011.
- 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.