Pyrotechnic composition
CA 2073543 A1 · Owner: Orica Canada Inc. · Inventors: Harding, Malcolm D.; Cooper, John; Brent, Geoffrey F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
36449, Abstract, Pyrotechnic Composition In the field of blasting, means for transmitting an initiating signal (non-electrically) to an explosive device to remotely detonate same in accordance with a predetermined delay period comprises mixed particles of a fuel and barium peroxide or lead dioxide as oxidant wherein the said oxidant particles have been treated with a surface active material that attaches to surface regions of the barium peroxide or lead dioxide particles to provide a surface array of hydrocarbyl chains which acts as a barrier to impede ingress of water vapour and or carbon dioxide, whereby tubing in which there is provided a dusting of such a pyrotechnic composition that is …
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 July 9, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2014.
- 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.