Patents by Inventor Andrew J. Tomkins

Andrew J. Tomkins has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Metallurgical flux compositions
    Patent number: 5028257
    Abstract: A metallurgical flux composition comprising calcium oxide, alumina, magnesium oxide and silica contains 22-35% by weight magnesium oxide and has a weight ratio of calcium oxide to magnesium oxide of from 0.6:1 to 2.5:1. The preferred composition contains 28-42% by weight calcium oxide, 13-21% by weight alumina, 22-35% by weight magnesium oxide and 3-8% by weight silica, preferably has a calcium oxide to magnesium oxide weight ratio of from 0.8:1 to 1.9:1 and preferably has a calcium oxide to silica weight ratio of from 6.0:1 to 7.5:1. The flux composition is particularly useful as a tundish cover in the continuous casting of steel.
    Type: Grant
    Filed: April 24, 1990
    Date of Patent: July 2, 1991
    Assignee: Foseco International Limited
    Inventors: Andrew J. Tomkins, Royston J. Phillips