Dc current sensor
CA 2133863 C · Owner: Yamaguchi, Shigeru · Inventors: Yamaguchi, Shigeru; Kawakami, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is an object of the present invention to provide a DC current sensor having, a relatively simple construction and a good detecting capability even for microscopic current variation such as a DC leakage breaker and the like particularly, it is an, object to provide a DC current sensor which is versatile and easy to mount to a wired lead. A lead wire being detected 1 is disposed through a strip type detecting core 2 constituted by an, integrated U-shaped detecting core member 2b I-shaped, detecting core members 21a, 21b and opposite portions 52a 52b, 52c, 52d of an exciting core 4 consisting of four pieces of substantially rectangular cylindrical core members 4a 4b, 4c, 4d disposed …
Read the whole patent
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 October 7, 1994 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2016.
- 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.