The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 1985
Filed:
Nov. 02, 1981
Peter J Kindlmann, Guilford, CT (US);
John C Yarwood, Madison, CT (US);
Gary L Ungarean, Woodbridge, CT (US);
Derek E Tyler, Cheshire, CT (US);
Olin Corporation, New Haven, CT (US);
Abstract
A multi-strand apparatus and process is provided for casting molten materials into ingots of desired shape. The apparatus comprises a plurality of devices for receiving and electromagnetically forming the molten material into desired shape. Each of the receiving and forming devices includes an inductor for applying a magnetic force field to the molten material. The inductor in operation is spaced from the molten material by a gap extending from the surface of the molten material to the opposing surface of the inductor. An alternating current applying device sends current to its associated inductor to generate the magnetic force field. Circuitry associated with each of the inductors senses variations in their respective gaps. The improvement comprises a pulse width modulating circuit associated with said gap variation sensing circuitry being connected to the alternating current applying device for controlling the application of alternating current to the inductor. A device is connected to the pulse width modulating circuit for synchronizing turn-on of all of the current applying devices whereby beat frequencies due to interaction between the plurality of inductors are substantially eliminated.