Delay type electric detonator
CA 1311152 C · Owner: Nippon Oil & Fats Co. Ltd. · Inventors: Harada, Masahide; Ochi, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
An electric detonator of delay type including a housing having a metal portion and an insulating portion, a pair of the leg wires extending outside through the housing, a delay circuit connected across the leg wires and generating an ignition current at a predetermined timing, and an igniting resistor connected to an output terminal of the delay circuit and one of the leg wires. In order to check the resistance value of the igniting resistor even after the detonator has been assembled, a by-pass resistor is connected between the other of -the leg wires and a junction point between the delay circuit and the igniting resistor. small measuring current is conducted through the igniting resistor …
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.
Why it's free to use
- Granted December 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 2009.
- 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.