Delay charge and element, and detonator containing such a charge
CA 2103343 C · Owner: Nitro Nobel Ab · Inventors: Karlsson, Bo; Carlsson, Staffan; Boberg, Tore
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A pyrotechnic delay charge for providing delays in the millisecond and second ranges, comprising the components bismuth oxide as an oxidation agent and silicon as a fuel. The invention also relates to a pyrotechnic delay element having an enclosure containing the pyrotechnical delay charge, and to a detonator having a housing ignition, means disposed at one end of the housing a base charge of, a secondary explosive disposed at the other end of the housing and the pyrotechnic delay charge disposed therebetween.
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 November 17, 1993 and granted August 25, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2015.
- 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.