David Kenneth Parks

US Patent:

6477065, Nov 5, 2002

Filed:

Feb 20, 2001

Appl. No.:

09/788803

Inventors:

David B. Parks - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02M 3335

US Classification:

363 2106, 363 2104

Abstract:

A power supply ( ) with vertical field effect transistor synchronous rectifiers (VFET and VFET ) having drivers (VFET Driver and VFET Driver ) which provide bipolar mode of operation by diode clamping an inductor overshoot which forwards biases the gate-source junction. The rectifiers have low on resistance useful in low output voltage power supplies.

US Patent:

62461850, Jun 12, 2001

Filed:

Dec 21, 1999

Appl. No.:

9/469069

Inventors:

David B. Parks - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G05F 100

US Classification:

315291

Abstract:

A high frequency arc lamp power supply (518) and display system (500). The power supply (518) drives an arc lamp (504) at a frequency high enough to several times higher than the display system's LSB frequency. By pulsing the lamp many times during each LSB period, the variations in light output during the pulses are all integrated in each bit period and do not degrade the quality of the image display. This eliminates the need for the controller (514) to synchronize the arc lamp power supply (518) with the spatial light modulator (502) when using pulse width modulation.

US Patent:

D3229181, Jan 7, 1992

Filed:

Jan 29, 1990

Appl. No.:

7/471993

Inventors:

David W. Parks - Dallas TX
Thomas A. Parks - Lindsay TX
Raymond Green - Richardson TX

Assignee:

Speedy Weedy, Inc. - Dallas TX

US Classification:

D 8 13

US Patent:

62085352, Mar 27, 2001

Filed:

Oct 31, 1994

Appl. No.:

8/331435

Inventors:

David B. Parks - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02M3/335

US Classification:

363 26

Abstract:

A power supply (500) with vertical field effect transistor synchronous rectifiers (VFET1 and VFET2) having drivers (VFET Driver1 and VFET Driver2) which provide bipolar mode of operation by diode clamping an inductor overshoot which forwards biases the gate-source junction. The rectifiers have low on resistance useful in low output voltage power supplies.

US Patent:

52527824, Oct 12, 1993

Filed:

Jun 29, 1992

Appl. No.:

7/905305

Inventors:

Gregory A. Cantrell - Mesquire TX
Paul V. Marshall - Garland TX
David L. Parks - Dallas TX

Assignee:

E-Systems, Inc. - Dallas TX

International Classification:

H05K 900

US Classification:

174 35R

Abstract:

A sensitive circuit area on a circuit board is isolated from an adjacent located non-sensitive circuit area by surrounding the sensitive circuit area with electrically interconnected ground planes positioned on the opposite sides of the circuit board. The isolation system further includes a "clam shell" RF/IF tight shield attached to each side of the circuit board enclosing the sensitive circuit area. A partially conductive gasket is placed between the clam shell and the top and bottom circuit board surfaces to enhance isolation performance.

US Patent:

50058886, Apr 9, 1991

Filed:

Jan 29, 1990

Appl. No.:

7/471303

Inventors:

David W. Parks - Dallas TX
Thomas A. Parks - Lindsay TX
Raymond Green - Richardson TX

Assignee:

Speedy Weedy, Inc. - Dallas TX

International Classification:

A01B 116

US Classification:

294 50

Abstract:

A garden tool for extracting a plant having roots in the earth. The garden tool basically comprises a housing and a prong assembly connected to the housing. The prong assembly includes a prong holder and at least three prongs with each prong being connected to the prong holder disposed generally near the outer peripheral surface of the prong holder. About one-fourth of a prong length of each of the prongs is disposed in the prong holder whereby the prong holder cooperates with the portions of the prongs disposed in the prong holder to provide sufficient strength for substantially reducing the tendency of the prongs to bend when disposed in the earth and rotated. The garden tool also includes a handle assembly which is connected to the upper end of the housing. The handle assembly and the prong assembly each are snappingly connectable to the housing and means are included for preventing the rotation of the prong assembly and the handle assembly relative to the housing in an assembled position of the prong assembly and the handle assembly connected to the housing. The present invention also contemplates a method of removing the plant using the garden tool wherein the earth surrounding the plant is moistened prior to the insertion of the prongs to facilitate the removal of substantially all of the root, and wherein the garden tool is rotated at least two full rotations to assure the formation of the plug.