Electronic safe/arm device
CA 2200705 C · Owner: Boucher, Craig J. · Inventors: Boucher, Craig J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
An electronic safe/arm device is powered internally by a low-voltage periodic , power source (12) that has insufficient voltage by itself to fire the detonator (18). The circuit therefore includes a step-up transformer (14) from which sufficient voltage to fire the detonator (18) is obtained. The step-up transformer (14) charges an arming circuit (16) which stores high-voltage power to fire the detonator (18) and also powers the firing circuit (20) which discharges the stored high-voltage energy through the detonator (18) at the appropriate time, to fire the device. The low-voltage periodic power source , (12) may include a low-voltage battery (120) and a dynamic switch (126) for …
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 October 12, 1995 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2017.
- 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.