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Expired Canadian patentCanada

Magnesium calcium oxide composite

CA 1287495 C · Owner: Green, William G. · Inventors: Green, William G.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A product and method of manufacture are set forth. The product is an injectable used in desulfurizing steel. In the process, Mg in its molten state, is vigorously stirred, and lime is added. A relatively brittle material is obtained upon cooling which can be ground to a particulate form and used as an injectable in steel desulfurization. The composite is both a mixture of Mg and CaO and also includes an alloy of Mg2Ca.

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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, and the Claude kit works from them.

Why it's free to use

  • Granted August 13, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 26, 1987
GrantedAugust 13, 1991
Term endedAugust 13, 2008
Patent numberCA 1287495 C
Classification (IPC)C21C7/06 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedJan 26, 1987Patent grantedAug 13, 1991Term endedAug 13, 2008

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.