Variable frequency resonator, variable frequency oscillator, and variable-frequency filter
CA 2196007 C · Owner: Ishikawa, Yohei · Inventors: Yamashita, Sadao; Ishikawa, Yohei; Sakamoto, Koichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable-frequency resonator has a dielectric strip serving as a main line and a dielectric strip serving as a sub line. A dielectric resonator is disposed therebetween and a, diode board is disposed at an intermediate point of the dielectric strip serving as the sub line. The electrical length of the sub line is switched according to the electrically conductive/open state of the diode. With this switching, the resonant frequency of the dielectric resonator is changed. Therefore, a variable-frequency resonator having a high Q value, a variable-frequency oscillator having a high C/N ratio, and a variable-frequency filter having low loss are implemented.
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 January 27, 1997 and granted June 6, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 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.