JAMES W BROWN, PT
Physical Therapy at Brookhurst St, Garden Grove, CA

4209837, Jun 24, 1980

Jul 3, 1978

5/921538

James R. Brown - Garden Grove CA

Beckman Instruments, Inc. - Fullerton CA

G06G 766

364117

There is disclosed a circuit for generating an error voltage which is proportional to the difference between a desired value of a physical parameter and the actual value of the physical parameter. The circuit operates by alternately switching the current from a source through a fixed reference resistor and a variable resistor, the resistance value of which changes as a function of the physical parameter to be controlled. The current is switched between the two resistors so that the average voltage generated across the variable resistor would be equal to the average voltage generated across the fixed resistor if the physical parameter had the desired value. By determining the difference between the average voltages across the resistors, the error voltage can be generated for controlling the physical parameter.

4436994, Mar 13, 1984

Dec 28, 1981

6/334810

James G. Van Vliet - La Habra CA
James R. Brown - Huntington Beach CA

Beckman Instruments, Inc. - Fullerton CA

H01J 3150

250207

A photomultiplier detector protection system and method utilizing a negative feedback loop to maintain the photomultiplier detector output below a predetermined output. The feedback loop comprises a comparator responsive to the photomultiplier detector output and also responsive to a predetermined limit signal. The comparator output is applied to a summing amplifier which also receives a voltage adjust signal. The output of the summing amplifier controls the output of a power supply which is in turn applied to the photomultiplier detector.

4971439, Nov 20, 1990

Jan 18, 1989

7/302061

James R. Brown - Huntington Beach CA

Beckman Instruments, Inc. - Fullerton CA

G01J 318

356319

A calibration method and apparatus for economical and rapid calibration of a scientific instrument utilizing a monochromator to generate monochromatic light utilizing controllable means for determining the angular position of a light dispersing element in the monochromator and a filter having a narrow absorption band(s) to determine a relationship between the wavelength of the monochromatic light generated by the monochromator and an angular position of the dispersing element so that the dispersing element can be rotated to an exact position for the monochromator to generate a selected wavelength of monochromatic light.

4310243, Jan 12, 1982

Oct 19, 1979

6/086388

James R. Brown - Garden Grove CA
Allen M. Diamond - Huntington Beach CA

Beckman Instruments, Inc. - Fullerton CA

G01J 300, G01J 144, H01J 4014

356300

In a spectrophotometer including a photomultiplier tube and an operational amplifier responsive to the current from the photomultiplier tube for generating a DC voltage proportional to light intensity, a method and means for simultaneously compensating for the dark current of the photomultiplier tube and the offset of the operational amplifier so that the output voltage of the operational amplifier is zero volts under dark conditions.

4279510, Jul 21, 1981

Oct 19, 1979

6/086389

James R. Brown - Garden Grove CA

Beckman Instruments, Inc. - Fullerton CA

G01J 300

356319

In a spectrophotometer including a photomultiplier tube responsive to light for producing an analog current proportional to the intensity thereof, an analog-to-digital converter, a signal path from the photomultiplier tube to the analog-to-digital converter, the analog-to-digital converter producing a digital signal as a function of the analog current, and computer means responsive to the digital signal for generating a signal for compensating for the dark current of the photomultiplier tube, there is disclosed a method and means for reducing the dark current correction error by temporarily increasing the gain of the signal path during calculation of the value of the compensating signal.

4488051, Dec 11, 1984

Dec 28, 1981

6/334808

James R. Brown - Huntington Beach CA
Roy W. Aday - Fullerton CA

Beckman Instruments, Inc. - Fullerton CA

G01D 534, G01J 318

250561

Apparatus for establishing a "home" position for a load element driven axially along the lead screw. A position sensor includes a first sensor element attached for axial travel with the load element and a second sensor element attached for rotation with the lead screw. The pair of sensor elements is operatively aligned at a predetermined relative axial and rotational position establishing the "home" position.

4779279, Oct 18, 1988

Apr 8, 1987

7/059231

James R. Brown - Huntington Beach CA

Beckman Instruments, Inc. - Fullerton CA

H01S 300

372 37

The present invention comprises a method and means for stabilizing the frequency difference between the component frequency modes in the beam of a gas laser influenced by Zeeman splitting. Stabilizing the frequency difference makes constant the frequency of the beat signal obtained from heterodyning the component modes. Stabilization is obtained by accurately controlling the difference in frequency between the component frequency modes to provide a selected separation, preferably 250 KHz, with deviation maintained at less than two KHz. The difference in frequencies is controlled independently of the individual frequency or intensity of either of the component frequency modes, or of their relative position within the "Doppler broadened" spectral profile characteristic of the lasing material.

4300203, Nov 10, 1981

Oct 19, 1979

6/086387

James R. Brown - Garden Grove CA

Beckman Instruments, Inc. - Fullerton CA

G06F 702

364577

A method and means for operating log converter circuits in which the method comprises the steps of sequentially conducting to the input of the log converter circuit signals representing a known transmittance (T) of 100% T, 10% T, 1% T, and 0. 1% T, these signals covering the range of operation of the log converter circuit, storing the outputs of the circuit as signals representing an absorbance (A) of 0A, 1A, 2A, and 3A, respectively, conducting to the input of the log converter circuit an unknown signal, and utilizing a microcomputer to perform a linear interpolation of the output of the circuit with the unknown signal applied thereto using the previously stored 0A, 1A, 2A, and 3A signals.