CHARLES J LEE, MD
Osteopathic Medicine at 7 Ave, Seattle, WA

5097490, Mar 17, 1992

Jan 14, 1991

7/640985

Rand H. Hulsing - Redmond WA
Charles K. Lee - Seattle WA

Sundstrand Data Control, Inc. - Redmond WA

G06M 312

377 28

Apparatus and method for counting frequency of a signal with improved resolution. Frequency counters (10, 60, and 100) accumulate clock cycles from a reference oscillator (20) during a sample interval. In the simplest form of the frequency counter, the reference clock signal is inverted and both the noninverted and inverted clock cycles are accumulated in separate counters (40 and 44). The accumulated counts are totaled in a summing circuit (48) and divided by two to determine their average, thereby doubling the resolution of the frequency counter. A more complex embodiment of the invention corrects a raw count of cycles of an input signal (12) that are accumulated during an extended sample interval defined by successive rising edges of a sample signal (114). The fractional portion of a cycle of the input waveform that occurred prior to the beginning of the extended sample interval is added to the raw count and the fractional portion of the input waveform that occurred after the end of the extended sample interval is subtracted. These fractional portions are defined as ratios of a partial count of clock cycles to a full count of clock cycled.

4139303, Feb 13, 1979

Jan 21, 1977

5/761365

F. Paul Carlson - Seattle WA
Charles K. Lee - Seattle WA

The Board of Regents of the University of Washington - Seattle WA

G01N 3316, G01N 1502, G01N 2100

356 39

Recognizing and counting geometrically distant objects, such as objects of a particular morphological type (e. g. , reticulated red blood cells), located in a field of objects of varying types is disclosed. Coherent light is directed toward a monolayer of objects of various types. The light scattered by the objects is collected by a collecting lens and forms a composite Fourier spectrum at the focal plane of the lens. The Fourier spectrum is selectively analyzed on the basis that each object creates a unique portion of the composite Fourier spectrum, and that a family of objects that are geometrically similar have additive spectrums, when their population is large, randomly located, and nonoverlapping. The analysis is performed by making intensity measurements at radial points in the Fourier plane, weighting the measurements, and summing the result. The radial points and weighting factors are determined using regression techniques.

5074051, Dec 24, 1991

Jul 20, 1990

7/555869

Dennis M. Cordy - Renton WA
Charles E. Lee - Seattle WA
Mark C. Maier - Renton WA
Richard R. Trujillo - Seattle WA

The Boeing Company - Seattle WA

G01B 2100

33520

A measuring instrument for measuring the distance from a hole, drilled at the intersection of a rib and a stringer, to the adjacent flange of the rib includes two arms projecting laterally out from the side of the instrument and forward to engage the flange. The arms are geared together at their inner ends within the body of the instrument to insure that the angles of both arms relative to the longitudinal axis of the body are equal to each other so that the longitudinal axis of the instrument in use remains perpendicular to the face of the flange. A spring loaded conical hole-centering probe protruding from the bottom face of the instrument fits into and centers itself in the hole and establishes a reference from which the flange is measured. A stylus, slidably mounted in the instrument and protruding from the front end thereof, contacts the face of the flange. A linear measuring gauge measures the position of the stylus in the instrument to provide an accurate measure of the distance of the flange to the hole in a direction perpendicular to the flange.

4786861, Nov 22, 1988

Sep 1, 1987

7/091977

Rand H. Hulsing - Redmond WA
Charles K. Lee - Seattle WA

Sundstrand Data Control, Inc. - Redmond WA

G01R 2302

324 78R

A device and method for measuring the frequency of an input signal by measuring the number of cycles of the input signal that occur in a sample interval between successive sampling times t. sub. n. An integer counter determines an estimated integer number of input signal cycles, and fraction counters determine fractional counts by counting cycles of a clock signal during time intervals between a first measurement time before the sampling time and a second measurement time after the sampling time. A correction circuit refines the fractional counts by determining the phase relationships between the clock and input signals at each measurement time. The correction circuit includes a constant current source, a capacitor, a first switch connected between the constant current source and a reference potential, a second switch connected between the constant current source and the capacitor, and a control circuit for the switches. The control circuit disconnects the current source from the reference potential at each measurement time, and disconnects the current source from the capacitor upon the next occurance of a periodic characteristic of the clock signal that occurs after the measurement time. The voltage on the capacitor then provides the required phase relationship.

4541105, Sep 10, 1985

Mar 23, 1984

6/592657

Charles K. Lee - Seattle WA
Rex B. Peters - Woodinville WA
Aleksandar M. Gogic - Seattle WA

Sundstrand Data Control, Inc. - Redmond WA

G01R 2300

377 19

An apparatus and method for counting the number of cycles of a sensor signal and of a reference signal that occur during respective time intervals associated with a sampling interval defined by a sample signal. Sensor and reference gate signals are produced and respectively define sensor and reference intervals. The sensor interval begins and ends synchronously with respect to the sensor signal, and the reference interval begins and ends synchronously with respect to the reference signal. The sensor, reference and sampling intervals are approximately coextensive with one another. Cycles of the sensor and reference signals are counted during the sensor and reference intervals, respectively. The process may be repeated for a plurality of successive sampling intervals.

4467651, Aug 28, 1984

Jan 6, 1983

6/456255

Rex B. Peters - Woodinville WA
Arnold Malametz - Carnation WA
Jeffrey F. Tonn - Tacoma WA
Charles K. Lee - Seattle WA
Aleksandar M. Gogic - Seattle WA
Victor B. Corey - Bellevue WA

Sundstrand Data Control, Inc. - Redmond WA

G01P 1510

73497

An accelerometer has two proof masses each constrained from movement by a beam resonant force transducer. The proof mass-force transducer systems are mounted with the sensitive axes of the proof masses aligned and the force transducers arranged so that their resonant frequencies f. sub. 1 and f. sub. 2 vary oppositely with a change in acceleration. The acceleration is determined in accordance with the relation a=A. sub. 1 f. sub. 1 -A. sub. 2 f. sub. 3 +A. sub. 0 or a=A. sub. 1 f. sub. 1. sup. 2 -A. sub. 2 f. sub. 2. sup. 2 +A. sub. 0 where a is the acceleration and A. sub. 1, A. sub. 2 and A. sub. 0 are calibration coefficients.