Metallothermal reaction mixture
CA 2104086 C · Owner: Elektro-Thermit Gmbh · Inventors: Wirtz, Johann-Hugo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A metallothermal reaction mixture of iron oxide and aluminum, and, optionally, additional additives including, at least about 20% by weight of iron oxide present in a spherical form or at least approximately spherical particles ranging in size between about 0.1 and 2.0 mm the, aluminum being present in a form which deviates from the spherical and is predominantly irregular in shape with a particle size of > 0 to about 1.5 mm.
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 August 13, 1993 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 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.