Resistance measuring circuit
CA 1079807 A · Owner: Honeywell Inc. · Inventors: Carmody, Joseph P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A resistance measuring circuit for providing an output signal which is linearly proportional to the difference in resistance between two unknown resistances. The measuring circuit includes a constant current source for driving both unknown resistances in a series circuit by connecting the series circuit in a feedback loop of an operational amplifier. The voltage drops across the unknown resistances are applied to the inverting and non-inverting inputs of a second operation amplifier used as a differential amplifier, respectively. The effect of leadwire resistance to the unknown resistances is cancelled by the subtractive operation of the second amplifier. Further the first amplifier is …
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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 June 17, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 17, 1997.
- 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.