Band pass filter circuit
CA 1137573 A · Owner: Fujitsu Limited · Inventors: Kurihara, Hiroshi; Takenaka, Sadao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the selection of a signal using a narrow band pass filter a, tracking type band pass filter is usually employed in order not to cause a phase difference between input and output even if the input frequency changes. However this tracking type band pass filter generates a delay time for the transitionary input signal since a feedback control is used. In the present invention, therefore, the input signal is divided into two parallel routes and they are combined again by a multiplier and phase difference between, input and output is successfully isolated from the effect of frequency by inserting band pass filters or delay lines and frequency multipliers or dividers This is achieved by making …
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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
- Granted December 14, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 14, 1999.
- 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.