US PATENT SUBCLASS 505 / 162
.~.~ Magnetic field sensing system or device (e.g., SQUID, etc.)

Current as of: June, 1999
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505 /   HD   SUPERCONDUCTOR TECHNOLOGY: APPARATUS, MATERIAL, PROCESS

150  DF  HIGH TEMPERATURE (Tc GREATER THAN 30 K) DEVICES, SYSTEMS, APPARATUS, COM- PONENTS, OR STOCK, OR PROCESSES OF USING {26}
160  DF  .~ Measuring or testing system or device {2}
162.~.~ Magnetic field sensing system or device (e.g., SQUID, etc.)

DEFINITION

Classification: 505/162

Magnetic field sensing system or device (e.g., SQUID, etc.):

(under subclass 160) System or device that utilizes superconductor sensitivity of the quantum-mechanical phase to determine strengths of extremely small magnetic fields.

(1) Note. A Superconductor Quantum Interference Device, or SQUID, may consist of a loop of superconducting material containing two Josephson junctions in parallel. The input current I splits into the two halves of the loop. When the magnetic field-dependent and junction-dependent phase shifts along the paths of split currents I1 and I2 due to the presence of a magnetic field quantum mechanical interference, the rejoining output current results in a total current that is less than the algebraic sum of I1 and I2, enabling the measurement of the quantum flux.

SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), particularly

9+, for low temperature superconducting material containing active solid-state devices.

324, Electricity: Measuring and Testing, particularly

248, for low temperature magnetometers.

600, Surgery, particularly 407+, for detecting nuclear or electromagnetic radiation, or subclass 410+ for magnetic resonance imaging.