Two wire circuit having an adjustable span
CA 1213955 A · Owner: Rosemount Inc. · Inventors: Frick, Roger L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two wire circuit has a total direct current signal, It, proportional to a sensor signal which is responsive to a parameter to be sensed. It flows through a first terminal which is coupled to an external power source and load and then through a second terminal. A current controller is coupled to the sensor and across the first and second terminals for controlling It. A feedback amplifier, amplifies a feedback signal which is responsive to It to provide an amplified feedback signal. A span adjustment is coupled to the feedback amplifier and the current controller for receiving the amplified feedback signal to adjust the amplified feedback signal such that It is controlled by the current …
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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 November 12, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2003.
- 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.