William Stephen Perkins

US Patent:

20020097221, Jul 25, 2002

Filed:

Jan 19, 2001

Appl. No.:

09/764388

Inventors:

Kofi Schulterbrandt - Mitchelleville MD, US
Rafael Samuels - Takoma Park MD, US
William Perkins - Anchorage AK, US

International Classification:

G09G005/08

US Classification:

345/157000

Abstract:

The present invention is drawn to a device having a transparent display superimposed over an object so that a user may view an object through the transparent display and may chose a point on the device that corresponds visually with a point on the object and the location of the chosen point is communicated between the device and a computer and a computer display displays where the object was touched.

US Patent:

44738170, Sep 25, 1984

Filed:

Apr 13, 1982

Appl. No.:

6/367849

Inventors:

William C. Perkins - Sachse TX

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H04M 1104

US Classification:

340310R

Abstract:

A circuit is described for bi-directionally coupling a communication signal around a distribution transformer. The circuit includes a single-phase coupling transformer with a primary to secondary voltage ratio approximately equal to that of the distribution transformer. A capacitor is connected to one of the secondary terminals of the coupling transformer. The capacitor is chosen so that the series circuit including the capacitor, the self inductance of the coupling transformer and, possibly, the series inductance of interconnecting lines is resonant at the carrier frequency of the communications signal. The series combination of the capacitor and the secondary of the coupling transformer can be connected between two of the conductors on the secondary side of the distribution transformer which are selected for communication signal propagation.

US Patent:

42440475, Jan 6, 1981

Filed:

Mar 20, 1979

Appl. No.:

6/022235

Inventors:

William C. Perkins - Sachse TX

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H04J 102
H04J 120

US Classification:

370 69

Abstract:

Multiplexed carrier signals modulated with digital data are transmitted through a medium polluted with harmonic signals by asymmetrically positioning the frequency of one of the carrier signals between two of the adjacent system harmonics, modulating that carrier signal with digital data at a baud rate so that the spectral density nulls of the modulated carrier signal in the frequency domain coincide with the two adjacent system harmonics to which spectral distribution the detector response is matched, generating at least one additional carrier signal whose frequency is also positioned between the two same adjacent system harmonics but is different from that of the other carrier signal and whose frequency separation from any adjacent carrier signal is equal to the baud rate or some multiple thereof, and modulating each additional carrier signal with digital data at the same baud rate.

US Patent:

40889572, May 9, 1978

Filed:

Jan 17, 1977

Appl. No.:

5/759946

Inventors:

William C. Perkins - Sachse TX

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H04B 116

US Classification:

325320

Abstract:

A differentially encoded carrier signal is synchronously detected by generating an output signal indicative of the carrier signal characteristic in each transmitted bit interval during the interval, storing it so that in the next bit interval it can be compared against the output signal for the immediately preceding transmitted bit interval to establish the characteristic differential to demodulate its information and forcing the output signal to zero in a subsequent bit interval after first using it as a reference for comparison with the output signal for the immediately succeeding transmitted bit interval to demodulate its information.

US Patent:

44582366, Jul 3, 1984

Filed:

Apr 13, 1982

Appl. No.:

6/367848

Inventors:

William C. Perkins - Sachse TX

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H04B 354

US Classification:

340310R

Abstract:

A circuit is disclosed for coupling a power line communications signal between two three-phase power lines, with the signal being transmitted in a balanced phase-to-neutral mode on the first line and in a phase-to-phase mode on the second line. The circuit includes two coupling transformers, one open-wye to open-delta, and the other open-delta to open-delta. The primary of one of the transformers is connected to one of the three-phase lines, while the primary of the other transformer is connected to the other three-phase lines. The secondaries of the transformers are connected together at one terminal of each and interconnected by a capacitor at the other terminal of each. Signal and power voltage ratios between the two power lines are matched, and the capacitor is selected to provide series resonance in the secondary loop of the coupling circuit at the power line communications signal carrier frequency.

US Patent:

46022406, Jul 22, 1986

Filed:

Mar 22, 1984

Appl. No.:

6/592139

Inventors:

William C. Perkins - Sachse TX

Assignee:

General Electric Company - King of Prussia PA

International Classification:

H04M 1104
H01F 3300
H01F 4010

US Classification:

340310R

Abstract:

A shunt three-phase wye-connected capacitor bank is connected intermediate a substation transformer and any source of zero-sequence power line carrier communication signals being transmitted on the substation distribution network to partially alleviate unbalance conditions in the communication signals which in the balanced condition are not passed by a three-phase substation transformer to the main transmission line. The signal is further attenuated by connecting the common wye-point of the capacitor bank through an inductance to neutral to form a shunt element of either an L or pi attenuation circuit with the series inductance of the substation transformer and the transmission line inductance forming the serial elements of the L or pi circuit. A further shunt element at another substation distribution network completes the attenuation circuit for the pi configuration.

US Patent:

41886194, Feb 12, 1980

Filed:

Aug 17, 1978

Appl. No.:

5/934449

Inventors:

William C. Perkins - Garland TX

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H04B 354
H04B 356

US Classification:

340310R

Abstract:

A communication signal is coupled simultaneously to all three phases of a neutral-wye three-phase power line through a transformer arrangement consisting of a low voltage set of three serially connected windings across which the signal is applied to produce the same current in all three windings and a high voltage set of three windings which are connected in a neutral-wye configuration to the power line with a winding of each set being magnetically coupled to a different winding of the other set such that the currents induced in all three windings of the high voltage set flow in the same direction with respect to the neutral connection.

US Patent:

44738161, Sep 25, 1984

Filed:

Apr 13, 1982

Appl. No.:

6/367845

Inventors:

William C. Perkins - Sachse TX

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H04M 1104

US Classification:

340310R

Abstract:

A circuit for bi-directionally bypassing a delta-wye transformer with a balanced phase-to-neutral power line communications signal, using passive components. The circuit includes a set of three capacitors connected in a wye configuration, each having one side connected to one of the three phase power lines on the delta side of the transformer. The circuit further includes a network connected from the node of the wye configuration of capacitors to the neutral conductor or conductors associated with the power lines on the two sides of the delta-wye transformer. The network includes a single phase transformer, as well as a capacitance connected from the secondary of this transformer to the node of the wye of the delta-wye transformer. The network further includes an inductive reactor connected from the neutral on the wye side of the delta-wye transformer to the node of the wye transformer. Component values of the network are selected so that the network is resonant from the three phase lines on the delta side of the transformer to the node on the wye side of the delta-wye transformer.

Author:

William H. Perkins

ISBN #:

0205135676

Author:

William H. Perkins

ISBN #:

0801637813

Author:

William H. Perkins

ISBN #:

0801637848

Author:

William H. Perkins

ISBN #:

0801637856

Author:

William H. Perkins

ISBN #:

0801637864

Author:

William H. Perkins

ISBN #:

0865770778

Author:

William H. Perkins

ISBN #:

0865770883

Author:

William H. Perkins

ISBN #:

0865770999