Filter circuit incorporating a differential amplifier
CA 1193678 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Van Roessel, Frederik J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter circuit which operates as a substantially optimum integrating circuit can be realized by means of a differential amplifier, a (-) input of which is connected to the amplifier's output via a seriesarrangement comprising a first resistor and a first capacitor, a (+) input of the amplifier being connected directly, and the output being connected via a seriesarrangement of a second resistor and a second capacitor to a terminal carrying a reference voltage. The junction of the second resistor and second capacitor constitute an output terminal of the filter circuit. The time constant of the first capacitor and the first resistor is substantially equal to the time constant of the second …
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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 September 17, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2002.
- 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.