David A Dudley

US Patent:

6569218, May 27, 2003

Filed:

Mar 8, 2001

Appl. No.:

09/802166

Inventors:

David Edmond Dudley - San Jose CA 95148

International Classification:

B01D 4604

US Classification:

553851, 55282, 55283, 55291, 55293, 55302, 55304, 55305, 55467, 55521, 55DIG 3, 95278, 95279, 15352

Abstract:

A method of using vacuum-cleaner filters includes mounting a cylindrical-shaped filter cartridge coaxially on a rotatable spindle. Then air is drawn radially through a filter material wall of the filter cartridge. Periodically, the cartridge filter on the spindle is spun to dislodge any debris entrapped in the filter material by centrifugal force. Air flow is selectively drawn or pushed radially through a filter material wall of the filter cartridge. A clutch disposed between a motor and the spindle is used to periodically spin the cartridge filter on the spindle to dislodge any debris entrapped in the filter material by centrifugal force. Preferably, a motor that can be run in either a forward direction or a reverse direction is used.

US Patent:

6681525, Jan 27, 2004

Filed:

Nov 15, 2000

Appl. No.:

09/714004

Inventors:

David Edmond Dudley - San Jose CA 95148

International Classification:

E05F 1100

US Classification:

49358, 49326, 49381, 16 62

Abstract:

A handicapped-entrance gate for retrofitting a train-station comprises a door panel that forces itself normally closed, but can be pushed open from either side. A closing mechanism is fully contained within a cap rail along to top edge of the door and operates in either direction to close the gate slowly after it has been opened. Fixed axles enter the gate panel from above and below on the pivoting side. The closing mechanism is geared to at least one of these fixed axles to allow the gate to be opened easily and to self-close over a period of time. Springs are used in opposition to hydraulic dampers such that the springs close the gate and the dampers delay the closing.

US Patent:

6739347, May 25, 2004

Filed:

Aug 25, 2001

Appl. No.:

09/939223

Inventors:

David Edmond Dudley - San Jose CA
Joseph D. Robertson - Fremont CA

Assignee:

Spin Clean Products, LLC - Fremont CA

International Classification:

B08B 300

US Classification:

134157, 134138, 134149, 134137, 248560, 248200, 248694, 269 1

Abstract:

The spindle assembly is self-centered on the end of the cylindrically shaped cartridge filter by a three-point grip on the perimeter. A similar spindle assembly is attached to the other end of the cartridge filter such that its axis of rotation is the same as the axis of rotation for the first spindle assembly. The tip of one spindle assembly is rested on the ground while the tip of the other spindle assembly is held by a users hand. A pressurized stream of air or water is directed at the cartridge filter with the users other hand such that the stream causes the whole to rotate. The speed of rotation is brought high enough to fling debris from the filter and thus clean it.

US Patent:

7016389, Mar 21, 2006

Filed:

Jan 24, 2003

Appl. No.:

10/351467

Inventors:

David R. Dudley - El Granada CA, US
Norman Hodgson - San Francisco CA, US
Hanna J. Hoffman - Palo Alto CA, US
Oliver Mehl - Mountain View CA, US

Assignee:

Spectra Physics, Inc. - Mountain View CA

International Classification:

H01S 3/091
H01S 3/094

US Classification:

372 75, 372 22, 372 21, 372 92, 372 96, 372 99

Abstract:

A diode end-pumped solid state laser is provided which produces improved power output, long term stability and improved conversion efficiency from the pumping power, high as well as low power operation while maintaining certain desirable common characteristics such as TEMoperation, circular outputs, readily aligned systems and compatibility with long lifetime for all components. The invention intracavity conversion to second, third and higher harmonics in several different spectral regimes. The invention also addresses the aspects of design flexibility, seeking in certain embodiments to provide a single platform for providing several harmonic beams.

US Patent:

8186729, May 29, 2012

Filed:

Sep 24, 2008

Appl. No.:

12/236592

Inventors:

David Dudley - San Jose CA, US

International Classification:

E05C 3/06

US Classification:

292201, 292144, 292340, 29234217, 292DIG 29, 292DIG 26, 49394, 49326, 49 49, 49 25

Abstract:

A bi-swing gate lock uses an electric actuator to unlatch the gate on request, and a failsafe mode that automatically unlatches the gate during emergencies or power failures. The traplock uses two swing arms that pivot retractable door stops in and out on either side of a closed gate from a stationary 4″ post. Loads trying to force open a locked gate are redirected through polyurethane pads on the sides of the retractable door stops directly to the insides of matching pockets within the post. Such loads can flex the swing arms, but significant loads will not reach the swing arm pivot bearings. Keeping the gate locked requires electric power applied to a lock actuator, and the loss of power automatically unlocks the traplock. Power applied to a retraction actuator pushes out the retractable door stops. A sensor detects when the gate returns to a closed position and the lock actuator can be energized once again.

US Patent:

20070286247, Dec 13, 2007

Filed:

May 24, 2007

Appl. No.:

11/805632

Inventors:

H. Yang Pang - San Jose CA, US
David Dudley - Montara CA, US
Jean-Marc Heritier - Sunnyvale CA, US
Norman Hodgson - Belmont CA, US

International Classification:

H01S 3/11
H01S 3/10
H01S 3/081
H01S 3/082

US Classification:

372 10, 372 22, 372 93, 372 97

Abstract:

An intracavity frequency-doubled includes a laser resonator including at least one gain element and two optically nonlinear crystals. The two optically nonlinear crystals independently double the frequency of fundamental radiation in the resonator. In one example the crystals are arranged to generate two frequency-doubled beams that are orthogonally plane-polarized with respect to each other. The beams can be combined by a polarization-selective combiner to form a common output.

US Patent:

56510209, Jul 22, 1997

Filed:

May 1, 1995

Appl. No.:

8/432301

Inventors:

William L. Nighan - Menlo Park CA
Mark S. Keirstead - San Jose CA
David R. Dudley - El Granada CA

Assignee:

Spectra-Physics Lasers, Inc. - Mountain View CA

International Classification:

H01S 308

US Classification:

372 92

Abstract:

A high power diode pumped laser is disclosed which has at least one resonator mirror and an output coupler. At least one laser crystal with strong thermal focussing properties is included. The laser includes at least one diode pump source supplying a pump beam to the laser crystal, producing a thermal lens in the laser crystal. The combination of the laser crystal, thermal lens, resonator mirrors and output coupler create a confocal-to-concentric resonator. An output beam is generated, which may be polarized. Further, a Q-switch may be included in the resonator, particularly when the laser crystal is Nd:YAG.

US Patent:

61562130, Dec 5, 2000

Filed:

Nov 22, 1999

Appl. No.:

9/447198

Inventors:

David E. Dudley - San Jose CA
Joseph D. Robertson - Fremont CA

International Classification:

E04H 316
B08B 900

US Classification:

210791

Abstract:

A water filter includes a cartridge filter element mounted on a coaxial bearing so it can be spun. During normal operation, a pressure tank enclosure allows the outside of the cartridge filter element to be submerged. Filtered water is then collected by a filtered-water return inside the cartridge filter element. An air vent disposed in the pressure tank housing allows water to drain away before starting a cleaning cycle, and to bleed off trapped air before returning to normal operation. During cleaning, a flow of clean water is applied to the filtered-water drain. A wash drain in the bottom of the pressure tank enclosure allows used cleaning water to flow out. The reverse water flow through the filtered-water drain forces closed a flapper valve. This, in turn, causes a water spray jet manifold to fill under pressure and cleaning water sprays out from slightly offset nozzles directed at the cartridge filter element. The coaxial bearing allows the cartridge filter element to spin under hydraulic pressure from the nozzle jet spray.