Wheatstone bridge with temperature gradient compensation
CA 2238017 C · Owner: Avisse, Jean-Bernard · Inventors: Avisse, Jean-Bernard; Chiron, Jeanine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The output voltage of an electrical circuit such as a Wheatstone bridge comprising four main resistors (J1 to J4) having substantially the same resistance value (R) and substantially the same temperature coefficient of resistance .alpha. is rendered insensitive to temperature differentials between the bridge arms by mounting a compensating element (r1 to r4) in each arm in series with the main resistor. Each compensating element is physically very close to a main resistor in one of the adjacent bridge arms so that it has the same temperature as said resistor. The compensating elements have the same resistance value r and the same TCR .beta. with R.alpha. = r.beta. where r is less …
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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
- Filed December 4, 1996 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2018.
- 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.