David A Coffey

Address:

PO Box 4729, Oneida, TN 37841

VIN:

JTDKB20U593477746

Make:

TOYOTA

Model:

PRIUS

Year:

2009

US Patent:

49068610, Mar 6, 1990

Filed:

Sep 30, 1988

Appl. No.:

7/251294

Inventors:

Apurba Roy - Whitehall PA
David M. Coffey - Knoxville TN

Assignee:

Cryomagnetics, Inc. - Oak Ridge TN

International Classification:

H01F 3600

US Classification:

307138

Abstract:

A superconducting switching device having no moving components for reversing current flow through a load. This load typically is a superconducting magnet and, in this application, the present invention also selectively serves as a persistent switch. The invention includes a pair of switching units connected between the load (magnet) and a current source. These switching units each have a pair of superconductor members and a mechanism for selectively producing in the switching units either a substantial electrical resistance or no resistance. Through the use of a control logic, the level of resistance of the switching units can be changed to effect the direction of current flow. In the case of the superconductor magnet, both switch units can be simultaneously made to have substantially zero resistance, and their interconnection forms the persistent switch for the superconducting magnet.

US Patent:

39740889, Aug 10, 1976

Filed:

Sep 19, 1974

Appl. No.:

5/507460

Inventors:

David L. Coffey - Oak Ridge TN

Assignee:

The Nucleus, Inc. - Oak Ridge TN

International Classification:

C09K 300

US Classification:

2523011R

Abstract:

An intimate mixture of americium-241 and iodine-129 provides an energy spectrum that reliably simulates the spectrum of iodine-125 in a well-type detector. As such, it may be used as a long-lived standard to calibrate instruments such as well scintillation spectrometers in which measurements are to be made involving iodine-125.