Curtis Joe Johnson

US Patent:

6859581, Feb 22, 2005

Filed:

Apr 2, 2003

Appl. No.:

10/405459

Inventors:

Lee M. Smith - Salt Lake City UT, US
Robert E. Benner - Salt Lake City UT, US
Aaron Carpenter - Salt Lake City UT, US
Eric Jacobsen - Salt Lake City UT, US
Curtis Johnson - West Jordan UT, US

Assignee:

Process Instruments, Inc. - Salt Lake City UT

International Classification:

G02B006/26
G02B006/28
G02B006/42
H04J014/02

US Classification:

385 26, 385 24, 385 25, 385 31, 385 16, 398 79, 398 82

Abstract:

An optical fiber multiplexer having a fixed plate and a rotating plate. A plurality of fiber-optic channels are coupled to the fixed plate in a circumferential arrangement. One fiber-optic channel is coupled to the rotating plate. Each fiber-optic channel may include one or more separate optical fibers. A servo motor rotates the rotating plate. Switching between channels occurs by rotating the rotating plate and aligning the optical fibers on the fixed plate and the rotating plate. Lens-to-lens coupling is used to transmit optical signals between the rotating and fixed plates. An adjustment device, such as a gimbal mount, may be used to adjust the horizontal and vertical axial alignment of the optical fibers coupled to the fixed plate so that optimum light signal transmission can occur. A control unit controls the operation of the servo motor.

US Patent:

40208303, May 3, 1977

Filed:

Mar 12, 1975

Appl. No.:

5/557545

Inventors:

Curtis C. Johnson - Sandy UT
Stanley D. Moss - Kaysville UT
Jiri A. Janata - Salt Lake City UT

Assignee:

The University of Utah - Salt Lake City UT

International Classification:

A61B 505
G01N 2746
G01N 3114

US Classification:

128 2E

Abstract:

A chemical sensitive field-effect transistor transducer capable of selectively detecting and measuring chemical properties of substances to which the transducer is exposed. The transducer includes a semiconductor substrate material having a certain doping polarity, a pair of spaced apart diffusion regions located at the surface of the substrate material and having a doping polarity opposite that of the substrate material, electrical insulator material overlying the diffusion regions and the surface of the substrate material lying between the diffusion regions, and a chemical selective system overlying the insulator material. The chemical selective system is adapted to interact with certain substances and thereby modulate an electric field produced in the substrate material between the diffusion regions. This modulation is dependent upon the chemical properties of the substances and provides a measure of those chemical properties. The chemical selective system may include various structures for measuring ion activity, immunochemical concentrations, reducible gas concentrations and the concentrations of enzymes and substrates.

US Patent:

41271211, Nov 28, 1978

Filed:

Sep 17, 1976

Appl. No.:

5/724194

Inventors:

Dwayne R. Westenskow - Salt Lake City UT
Curtis C. Johnson - Salt Lake City UT

Assignee:

University of Utah - Salt Lake City UT

International Classification:

A61M 1600

US Classification:

128142R

Abstract:

A device for continuously monitoring oxygen consumption and anesthesia gas uptake of surgical patients, having servo-controlled replenishment mechanisms to automatically maintain preset levels of oxygen and anesthesia gas for inhalation. A closed, recirculating delivery circuit is utilized to adminster an appropriate volume of oxygen and anesthesia gas to a surgical patient. An oxygen sensor monitors decreases in oxygen concentration within the recirculatory system and triggers restoration to the preset concentration by means of feedback comparator circuitry. With the oxygen held at the desired level, any volume changes in the system are caused by uptake of anesthesia gas, which is monitored by detecting variations in the expansion of a respirator bellows. The desired amount of anesthesia gas is preset and maintained by a potentiometric monitoring device which produces a voltage proportional to the peak expansion of the bellows. Variations from the preset level of anesthesia gas drive a servo-mechanism for replenishing the anesthesia gas to the preset value.