Self-calibrating overcurrent detector
CA 1165396 A · Owner: International Business Machines Corporation · Inventors: Rice, Anthony J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Circuit for detecting a fault current in an installation where the load (RL) varies upon request. Current (IS) is converted into a voltage (VS). During an initialization cycle, means such as a counter, ditital-to-analog converter comparator, registers (R1 R2) generate a voltage (VC) equal to (VS) at the end of the initialization cycle and a threshold voltage (VD=kVC). During operation voltage (VS), is compared with threshold (VD) in order to provide a fault detection indication which is transmitted to the protection circuit by a logic circuit, that is, an AND gate and an OR gate. During the initialization cycle, protection is obtained by comparing (VS) with a reference voltage in the …
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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 April 10, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 10, 2001.
- 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.