Jerome E Ostenson

US Patent:

6514557, Feb 4, 2003

Filed:

Aug 24, 2001

Appl. No.:

09/939307

Inventors:

Douglas K. Finnemore - Ames IA
Paul C. Canfield - Ames IA
Sergey L. Budko - Ames IA
Jerome E. Ostenson - Ames IA
Cedomir Petrovic - Ames IA
Charles E. Cunningham - Ames IA
Gerard Lapertot - Grenoble, FR

Assignee:

Iowa State University Research Foundation - Ames IA

International Classification:

B05D 512

US Classification:

427 62, 427117, 427124, 42722524, 4272554, 29599

Abstract:

A process to produce magnesium diboride objects from boron objects with a similar form is presented. Boron objects are reacted with magnesium vapor at a predetermined time and temperature to form magnesium diboride objects having a morphology similar to the boron objects original morphology.

US Patent:

6591119, Jul 8, 2003

Filed:

Oct 21, 2002

Appl. No.:

10/277013

Inventors:

Douglas K. Finnemore - Ames IA
Paul C. Canfield - Ames IA
Sergey L. Budko - Ames IA
Jerome E. Ostenson - Ames IA
Cedomir Petrovic - Ames IA
Charles E. Cunningham - Ames IA
Gerard Lapertot - Grenoble, FR

Assignee:

Iowa State University Research Foundation - Ames IA

International Classification:

H01B 1200

US Classification:

505230, 230220, 230239

Abstract:

A process to produce magnesium diboride objects from boron objects with a similar form is presented. Boron objects are reacted with magnesium vapor at a predetermined time and temperature to form magnesium diboride objects having a morphology similar to the boron objects original morphology.

US Patent:

51892600, Feb 23, 1993

Filed:

Feb 6, 1991

Appl. No.:

7/651551

Inventors:

Douglas K. Finnemore - Ames IA
Theodore A. Miller - Tuscon AZ
Jerome E. Ostenson - Ames IA
Louis A. Schwartzkopf - Mankato MN
Steven C. Sanders - Ames IA

Assignee:

Iowa State University Research Foundation, Inc. - Ames IA

International Classification:

H01B 1200

US Classification:

1741251

Abstract:

A strain tolerant microfilamentary wire capable of carrying superconducting currents is provided comprising a plurality of discontinuous filaments formed from a high temperature superconducting material. The discontinuous filaments have a length at least several orders of magnitude greater than the filament diameter and are sufficiently strong while in an amorphous state to withstand compaction. A normal metal is interposed between and binds the discontinuous filaments to form a normal metal matrix capable of withstanding heat treatment for converting the filaments to a superconducting state. The geometry of the filaments within the normal metal matrix provides substantial filament-to-filament overlap, and the normal metal is sufficiently thin to allow supercurrent transfer between the overlapped discontinuous filaments but is also sufficiently thick to provide strain relief to the filaments.

US Patent:

45327033, Aug 6, 1985

Filed:

Apr 24, 1981

Appl. No.:

6/257013

Inventors:

John D. Verhoeven - Ames IA
Edwin D. Gibson - Ames IA
Douglas K. Finnemore - Ames IA
Jerome E. Ostenson - Ames IA
Frederick A. Schmidt - Ames IA
Charles V. Owen - Ames IA

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

H01L 3924

US Classification:

29599

Abstract:

An improved method of preparing composite multifilament superconducting wire of Nb. sub. 3 Sn in a copper matrix which eliminates the necessity of coating the drawn wire with tin. A generalized cylindrical billet of an alloy of copper containing at least 15 weight percent niobium, present in the copper as discrete, randomly distributed and oriented dendritic-shaped particles, is provided with at least one longitudinal opening which is filled with tin to form a composite drawing rod. The drawing rod is then drawn to form a ductile composite multifilament wire containing a filament of tin. The ductile wire containing the tin can then be wound into magnet coils or other devices before heating to diffuse the tin through the wire to react with the niobium forming Nb. sub. 3 Sn. Also described is an improved method for making large billets of the copper-niobium alloy by consumable-arc casting.

US Patent:

49701940, Nov 13, 1990

Filed:

Jul 21, 1989

Appl. No.:

7/383872

Inventors:

Louis A. Schwartzkopf - Mankato MN
Jerome E. Ostenson - Ames IA
Douglas K. Finnemore - Ames IA

Assignee:

Iowa State University Research Foundation - Ames IA

International Classification:

F04B 4188
H01B 1204

US Classification:

505001

Abstract:

Fibers of YBa. sub. 2 Cu. sub. 3 O. sub. x have been produce by pendant drop melt extraction. This technique involves the end of a rod of YBa. sub. 2 Cu. sub. 3 O. sub. x melted with a hydrogen-oxygen torch, followed by lowering onto the edge of a spinning wheel. The fibers are up to 10 cm in length with the usual lateral dimensions, ranging from 20. mu. m to 125. mu. m. The fibers require a heat treatment to make them superconducting.

US Patent:

48183040, Apr 4, 1989

Filed:

Oct 20, 1987

Appl. No.:

7/110974

Inventors:

John D. Verhoeven - Ames IA
O. Dale McMasters - Ames IA
Edwin D. Gibson - Ames IA
Jerome E. Ostenson - Ames IA
Douglas K. Finnemore - Ames IA

Assignee:

Iowa State University Research Foundation, Inc. - Ames IA

International Classification:

H01F 102

US Classification:

148103

Abstract:

This invention comprises a method of increasing the magnetostrictive response of rare earth-iron (RFe) magnetostrictive alloy rods by a thermal-magnetic treatment. The rod is heated to a temperature above its Curie temperature, viz. from 400. degree. to 600. degree. C. ; and, while the rod is at that temperature, a magnetic field is directionally applied and maintained while the rod is cooled, at least below its Curie temperature.

US Patent:

53309693, Jul 19, 1994

Filed:

Nov 24, 1992

Appl. No.:

7/980759

Inventors:

Douglas K. Finnemore - Ames IA
Theodore A. Miller - Tucson AZ
Jerome E. Ostenson - Ames IA
Louis A. Schwartzkopf - Mankato MN
Steven C. Sanders - Ames IA

Assignee:

Iowa State University Research Foundation, Inc. - Ames IA

International Classification:

B05D 512
H01B 1200

US Classification:

505431

Abstract:

A strain tolerant multifilamentary wire capable of carrying superconducting currents is provided comprising a plurality of discontinuous filaments formed from a high temperature superconducting material. The discontinuous filaments have a length at least several orders of magnitude greater than the filament diameter and are sufficiently strong while in an amorphous state to withstand compaction. A normal metal is interposed between and binds the discontinuous filaments to form a normal metal matrix capable of withstanding heat treatment for converting the filaments to a superconducting state. The geometry of the filaments within the normal metal matrix provides substantial filament-to-filament overlap, and the normal metal is sufficiently thin to allow supercurrent transfer between the overlapped discontinuous filaments but is also sufficiently thick to provide strain relief to the filaments.

US Patent:

43783309, Mar 29, 1983

Filed:

Mar 12, 1979

Appl. No.:

6/019808

Inventors:

John D. Verhoeven - Ames IA
Douglas K. Finnemore - Ames IA
Edwin D. Gibson - Ames IA
Jerome E. Ostenson - Ames IA

Assignee:

The United States of America as represented by the Department of Energy - Washington DC

International Classification:

C22F 108
H01L 3900

US Classification:

420432

Abstract:

An alloy for the commercial production of ductile superconducting wire is prepared by melting together copper and at least 15 weight percent niobium under non-oxygen-contaminating conditions, and rapidly cooling the melt to form a ductile composite consisting of discrete, randomly distributed and orientated dendritic-shaped particles of niobium in a copper matrix. As the wire is worked, the dendritric particles are realigned parallel to the longitudinal axis and when drawn form a plurality of very fine ductile superconductors in a ductile copper matrix. The drawn wire may be tin coated and wound into magnets or the like before diffusing the tin into the wire to react with the niobium. Impurities such as aluminum or gallium may be added to improve upper critical field characteristics.