Donald Wray Craig

US Patent:

6793707, Sep 21, 2004

Filed:

Jan 10, 2002

Appl. No.:

10/043644

Inventors:

Donald B. Craig - Fletcher NC
Leonard S. Aubrey - Arden NC
Thomas J. Margaria - Passy, FR

Assignee:

Pechiney Electrometallurgie - Cedex
Porvair PLC

International Classification:

C21C 100

US Classification:

75305, 75316, 75407, 75526, 420 29, 420 30, 420 31, 420 32, 420 33, 266216

Abstract:

A method for inoculating molten iron. The method comprises passing the molten iron through a filter assembly at an approach velocity of about 1 to about 60 cm/sec. The filter assembly comprises a filter element and an inoculation pellet in contact with the filter element. The pellet has an inoculant dissolution rate of at least 1 mg/sec. to no more than 320 mg/sec. and comprises about 40-99. 9%, by weight, carrier comprising ferrosilicon. The pellet further comprises about 0. 1-60%, by weight, at least one inoculating agent selected from a group consisting of cerium, strontium, zirconium, calcium, manganese, barium, bismuth, magnesium, titanium and aluminum or from rare earths.

US Patent:

6977058, Dec 20, 2005

Filed:

Mar 11, 2003

Appl. No.:

10/385813

Inventors:

Leonard S. Aubrey - Arden NC, US
Donald B. Craig - Fletcher NC, US
Steven H. Martin - Hendersonville NC, US

Assignee:

Porvair PLC - Norfolk

International Classification:

C21C007/00

US Classification:

266229, 266216, 75316

Abstract:

A strainer for molten metal. The strainer comprises a well and a multiplicity of passages. Each passage comprises a first cavity a second cavity with a smaller equivalent diameter than the first cavity. A neck is between the first cavity and second cavity. An inoculation pellet is received in the well.

US Patent:

20100194007, Aug 5, 2010

Filed:

Sep 25, 2008

Appl. No.:

12/679720

Inventors:

Donald B. Craig - Fletcher NC, US
Steven H. Martin - Hendersonville NC, US
Rudolph A. Olson - Hendersonville NC, US
Robert Simpson - Sycamore IL, US
Eldon Rohlena - Dekalb IL, US

International Classification:

B01D 25/00
B01D 29/50

US Classification:

266227

Abstract:

An improved filter assembly for molten metal is described. The assembly has a canister with at least one port wherein the port allows filtered molten metal to flow from the canister. A plurality of filter elements is in the canister wherein the filter elements separate a volume of the canister into a primary chamber and a secondary chamber wherein the secondary chamber is in direct flow communication with the port. A ported cover is over the canister wherein the ported cover prohibits unfiltered molten metal from flowing directly into the secondary chamber. The molten metal flows from the primary chamber to the secondary chamber through a filter element.