Planar variable power divider
CA 2118901 C · Owner: Laben S.P.A. · Inventors: Ravanelli, Rodolfo; Mizzoni, Roberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Microwave variable power divider, comprising (Fig. 1) a 3 dB directional coupler (1) (called hybrid circuit) followed on one output leg by a variable phase shifter obtained by assemblying a -3dB directional coupler (2) with its outlets closed on movable short-circuits (6; 7) that can ensure its variability, and on the other by a 90-degree differential phase shifter (5) and an analogous variable phase shifter consisting of directional coupler (3) and movable short-circuits (8; 9), followed by another directional coupler (4). The device makes it possible to vary the power on the two output legs (12; 13) in a complementary manner by regulating the movement of the movable short-circuits. The …
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 March 11, 1994 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2016.
- 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.