Timing apparatus
CA 2026220 C · Owner: Marsh, Michael John Camille · Inventors: Hodson, Trevor Meredith; Atkins, Raymond Catherall; Marsh, Michael John Camille
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordNo Claude kit for weapons
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Abstract From the Canadian patent
The invention relates to a blasting apparatus for activating a plurality of electrical detonators after predetermined time delays. The blasting apparatus includes a plurality of remote electrical delay devices. Each device is linked to a detonator and is arranged to, be serially programmed with a timing signal which, originates from the central control unit and which determines the time delay. A bidirectional signal harness, having ends which terminate at I/O ports in the control unit, serially links the delay devices to the control unit. In the event of a fault of discontinuity occurring in the harness prior to programming of the delay devices, the discontinuity is detected and the …
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
- Filed September 26, 1990 and granted March 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 2012.
- 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.