Relay trouble detecting device
CA 1263144 C · Owner: Umemura, Heihachiro · Inventors: Umemura, Heihachiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A relay trouble detecting device which at the outbreak of any trouble in a relay (including a magnet switch) detects such trouble immediately and gives an alarm. This device is provided with a sensor for detecting driving current arranged at a driving circuit for a load and a judging circuit to which signals from the sensor and operation signals from a relay operation circuit are input. the judging circuit stores the value of mutual relation between the two signals in normal condition and works an alarm circuit when the mutual relation between the two signals shows the value outside the standard.
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
- Granted November 21, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 21, 2006.
- 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.