Mark S Diiorio

US Patent:

55959598, Jan 21, 1997

Filed:

Nov 22, 1994

Appl. No.:

8/344273

Inventors:

Mark S. DiIorio - San Diego CA
Shozo Yoshizumi - San Diego CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

H01L 3924

US Classification:

505329

Abstract:

A method of forming a high-Tc microbridge superconductor device is disclosed, which comprises the steps of forming an inclined step on the surface of a substrate, the inclined step having an angle of inclination of from about 20 to about 80 degrees; depositing a layer of c-axis oriented superconductor material overlying the substrate such that there is a break in the layer of superconductor material at the inclined step; and depositing a layer of normal material overlying the layer of c-axis oriented superconductor material.

US Patent:

55062008, Apr 9, 1996

Filed:

Feb 6, 1992

Appl. No.:

7/831905

Inventors:

Eugene C. Hirschkoff - Leucadia CA
Mark S. DiIorio - San Diego CA
Richard T. Johnson - San Diego CA
D. Scott Buchanan - Escondido CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

G01R 33035

US Classification:

505162

Abstract:

A magnetometer comprises a magnetic field pickup coil and a magnetic field detector that receives electrical signals from the pickup coil and produces an electrical detector output responsive thereto. The pickup coil and detector, which are preferably made of high temperature superconductors, are enclosed in an insulated enclosure having no vacuum insulation structure. Preferably, the enclosure is made of a foamed polymer material such as styrofoam. A coolant is provided to the interior of the enclosure, to cool the pickup coil and detector to a temperature below their superconducting transition temperature. A number of such modular magnetometers may be connected together to form an array.

US Patent:

51589320, Oct 27, 1992

Filed:

Jul 17, 1990

Appl. No.:

7/551841

Inventors:

Waldo S. Hinshaw - Solana Beach CA
Douglas N. Paulson - Del Mar CA
David S. Buchanan - Escondido CA
Eugene C. Hirschkoff - Leucadia CA
Mark S. DiIorio - San Diego CA
William C. Black - Del Mar CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

G01R 33035
A61B 505
H01B 1200
H01F 508

US Classification:

505 1

Abstract:

A biomagnetometer has a magnetic pickup coil positioned remotely from a detector and inductively coupled to the detector. The detector is preferably made from a low-temperature superconductor, while the pickup coil can be made of a high-temperature superconductor. The detector and pickup coil can therefore be placed into separate containers, with an inductive coupler between the containers. In one approach, the detector is maintained at liquid helium temperature, and the pickup coil and electrical connector are cooled by liquid nitrogen. The resulting biomagnetometer permits the container with the pickup coil to be moved and positioned easily, and to be changed readily between various configurations particularly suited for performing various functions.

US Patent:

51341174, Jul 28, 1992

Filed:

Jan 22, 1991

Appl. No.:

7/644905

Inventors:

Mark S. DiIorio - San Diego CA
Shozo Yoshizumi - San Diego CA
Kai-Yueh Yang - San Diego CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

H01B 1200
H01L 3922
H01L 3912

US Classification:

505 1

Abstract:

A microbridge superconductor device includes a substrate, made of a material such as LaAlO. sub. 3, having a lower planar substrate surface, an inclined surface having an overall upward inclination of from about 20 to about 80 degrees from the plane of the lower planar substrate surface, and an upper planar substrate surface parallel to the lower planar substrate surface and separated from the lower planar substrate surface by the inclined surface. A layer of a c-axis oriented superconductor material, made of a material such as YBa. sub. 2 Cu. sub. 3 O. sub. 7-x, is epitaxially deposited on the lower planar substrate surface, and has an exposed a-axis edge adjacent the intersection of the lower planar substrate surface with the inclined surface. The a-axis exposed edge is beveled away from the intersection. A layer of a c-axis oriented superconductor material is epitaxially deposited on the upper planar substrate surface, and has an exposed a-axis edge adjacent the inclined surface.

US Patent:

53671783, Nov 22, 1994

Filed:

Jun 5, 1992

Appl. No.:

7/894079

Inventors:

Mark S. DiIorio - San Diego CA
Shozo Yoshizumi - San Diego CA
Kai-Yueh Yang - San Diego CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

H01L 3922

US Classification:

505190

Abstract:

A microbridge superconductor device includes a substrate, made of a material such as LaAlO. sub. 3, having a lower planar substrate surface, an inclined surface having an overall upward inclination of from about 20 to about 80 degrees from the plane of the lower planar substrate surface, and an upper planar substrate surface parallel to the lower planar substrate surface and separated from the lower planar substrate surface by the inclined surface. A layer of a c-axis oriented superconductor material, made of a material such as YBa. sub. 2 Cu. sub. 3 O. sub. 7-x, is epitaxially deposited on the lower planar substrate surface, and has an exposed a-axis edge adjacent the intersection of the lower planar substrate surface with the inclined surface. The a-axis exposed edge is beveled away from the intersection. A layer of a c-axis oriented superconductor material is epitaxially deposited on the upper planar substrate surface, and has an exposed a-axis edge adjacent the inclined surface.

US Patent:

50616803, Oct 29, 1991

Filed:

Jul 31, 1989

Appl. No.:

7/386948

Inventors:

Douglas N. Paulson - Del Mar CA
David S. Buchanan - San Diego CA
Eugene C. Hirschkoff - Leucadia CA
Mark S. DiIorio - San Diego CA
William C. Black - Del Mar CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

G01R 33035
A61B 505
H01B 1200
H01F 508

US Classification:

505 1

Abstract:

A biomagnetometer has a magnetic pickup coil positioned remotely from the detector. The detector is made from a low-temperature superconductor, while the pickup coil and an electrical connector between the detector and the pickup coil are made of a high-temperature superconductor. Although the detector is maintained in a dewar at a sufficiently low temperature to reduce electronic noise, the pickup coil and the electrical connector need only be maintained at a temperature at which they are superconducting. In one approach, the detector is maintained at liquid helium temperature, and the pickup coil and electrical connector are cooled by liquid nitrogen. The resulting biomagnetometer permits the pickup coil to be moved and positioned easily, and to be changed readily.

US Patent:

59628669, Oct 5, 1999

Filed:

Jun 27, 1996

Appl. No.:

8/671512

Inventors:

Mark S. DiIorio - San Diego CA
Shozo Yoshizumi - San Diego CA
Kai-Yueh Yang - San Diego CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

H01L 2906
H01L 310256
H01L 3922

US Classification:

257 33

Abstract:

A superconductor device has a substrate with an inclined surface that divides the substrate surface into a lower planar substrate surface and an upper planar substrate surface. A lower layer of an anisotropic superconductor material is epitaxially deposited on the lower planar substrate surface so that an a-axis of the anisotropic superconductor material of the lower layer is exposed at a top edge of the lower layer. An upper layer of an anisotropic superconductor material is epitaxially deposited on the upper planar substrate surface so that an a-axis of the anisotropic superconductor material of the upper layer is exposed at a top edge of the upper layer. A layer of a non-superconductor material overlies the inclined surface and the layers of anisotropic superconductor material.

US Patent:

54422892, Aug 15, 1995

Filed:

Oct 27, 1992

Appl. No.:

7/967217

Inventors:

Mark S. DiIorio - Del Mar CA
Eugene C. Hirschkoff - Leucadia CA
Richard T. Johnson - San Diego CA
D. Scott Buchanan - Escondido CA
Stephen O. James - San Diego CA
Douglas Paulson - Del Mar CA
William C. Black - Del Mar CA

Assignee:

Biomagnetic Technologies, Inc. - San Diego CA

International Classification:

G01R 33035
A61B 505
H01F 606

US Classification:

324248

Abstract:

A biomagnetometer includes a magnetic field sensor unit having a magnetic field pickup coil. A vessel contains the sensor unit. The vessel includes a flexible contact face with the magnetic field sensor unit mounted in the interior of the vessel adjacent to the flexible contact face. Insulation at the flexible contact face of the vessel prevents excessive heat flow through the flexible contact face. Pickup units using this structure can be connected together into flexible or rigid arrays. In operation, the pickup coil is cooled to a temperature of less than its superconducting transition temperature. A detector measures the magnitude of magnetic fields sensed by the sensor unit.