DONALD E JONES
Real Estate Commission in Pittsburgh, PA

3984831, Oct 5, 1976

Dec 12, 1974

5/532066

Donald H. Jones - Pittsburgh PA
Robert G. Burig - Allison Park PA
Paul F. McNally - Gibsonia PA

Control Systems Research, Inc. - Pittsburgh PA

H03K 1302, G06G 722

340347SY

A tracking digital angle encoder utilizing a translator, for providing the difference between an analog angle input and a digital angle input, a counter, which feeds the digital angle input to the translator, a detector, which controls the counter and is connected to the output of the translator to be activated by the output of the translator exceeding a predetermined trigger value, all of which are connected to cause the counter to count to a position where the output of the translator is less than the predetermined trigger level. When the output of the translator is less than the predetermined trigger value, the output of the counter provides a digital signal which closely approximates the analog angle input to the translator. A balanced demodulator which is connected to the output of the translator and receives a signal from a reference oscillator, which is equal to the carrier frequency, provides a pure sine function output representing the difference between the analog and digital inputs to the translator. An adjustment is provided between the counter and the threshold detector which permits the level at which the threshold detector activates the counter to be varied and thus the angle, to which each bit of the counter is equivalent, can be varied.

4060799, Nov 29, 1977

Sep 5, 1974

5/503431

Donald H. Jones - Pittsburgh PA

Control Systems Research, Inc. - Pittsburgh PA

G08C 1948

340198

A two-speed resolver system wherein the rotor of a fine brushless resolver which is directly connected to the shaft to be instrumented is connected to the rotor of a coarse resolver so that the rotor ofthe coarse brushless resolver rotates at a proportional but different rate than the fine resolver and the electrical output of the fine resolver which represents the position of the input shaft is fed to the electrical input on the coarse resolver and combined with the mechanical input to the coarse resolver to provide a signal out of the coarse resolver which indicates a predetermined fraction of angular rotation for each revolution of the rotor of the fine resolver. The disclosed two-speed resolver system utilizes brushless resolvers wherein the electrical connections to the rotors are through brushless rotary transformers. Two gears having a different number of teeth can be used to couple the rotor of the fine resolver to the rotor of the coarse resolver. The difference between the coarse resolver mechanical rotation and the fine resolver electrical output when subtracted by the coarse resolver determines the fractional rotation indicated by the coarse resolver for each revolution of the fine resolver rotor.

4057715, Nov 8, 1977

Nov 6, 1973

5/413276

Donald J. Jones - Pittsburgh PA
Guy E. Davis - Martinez CA

Westinghouse Electric Corporation - Pittsburgh PA

F01D 1702, G05B 1500, G06F 1506

364494

An electric power plant including a steam generator and a steam turbine is operated by a control system including two redundant digital computers. Switching circuitry is provided for coupling one of the computers through interface equipment to the steam generator and the turbine and a generator according to programmed computer control. A data link is established between the computers to transfer manual/automatic status and other needed data from the control computer to the standby computer. A system is provided for detecting when certain hardware and software malfunctions have occurred and for responsively transferring control to the standby computer. The standby computer is tracked to the control computer so that control computer transfer can be made reliably without disturbing the electric power generation process. The turbine control includes a speed control loop which is implemented with computer operations. Startup control is also implemented in startup control loops for the steam generator by means of computer operations.

4540925, Sep 10, 1985

Jul 19, 1984

6/632315

Donald H. Jones - Pittsburgh PA

Contraves Goerz Corporation - Pittsburgh PA

G05B 1928

318602

The motor control system for an electric motor having no mechanical means integral therewith for commutating current provides the ability to control position, velocity and torque of such a motor to the degree achievable with DC motors having mechanical commutators. Such a result is achieved by maintaining a desired spatial relationship between the resultant magnetic field created by the stationary member and the movable member of the electric motor. The control system includes detecting apparatus for detecting parameters of the motor that dictate, in part, the desired spatial relationship within the motor and command apparatus for creating a motor command signal which, when generated in the motor, causes the desired spatial relationship to be established. The present invention also permits maintenance of an optimal spatial relation--a spatial relationship that causes the motor to produce desired torque with a minimum excitation.

4577271, Mar 18, 1986

Aug 15, 1983

6/523061

Donald H. Jones - Pittsburgh PA
Spencer W. Allen - Murrysville PA

International Cybernetics Corporation - Pittsburgh PA

G06F 1546, G05B 1302

364174

The present invention provides a high response inexpensive microprocessor based control system. The system uses only one detector that detects only one motion characteristic of the object controlled by the system. In the preferred embodiment, the system controls the position and velocity of the movable member of the motor by creating commands that represent the desired position of the movable member 1024 times per second. The system also provides methods for improving the accuracy and precision of the system.

3985812, Oct 12, 1976

Nov 14, 1974

5/523626

Elsio Del Bel - Bethel Park PA
Donald C. Jones - Pittsburgh PA
Martin B. Neuworth - Pittsburgh PA

Continental Oil Company - Ponca City OK

C07C 3738, C07C 3744

260621B

2,3,6-Trimethylphenol is recovered in high yield and high purity from its admixture with di- and tri- methyl-substituted phenols by subjecting the admixture in a solvent to countercurrent caustic extraction.