David Duncan Wilkinson

US Patent:

7657494, Feb 2, 2010

Filed:

Sep 20, 2006

Appl. No.:

11/533550

Inventors:

David A. Wilkinson - Concord CA, US
Tina Yu - St. John's NL, CA
Alexandre Castellini - San Francisco CA, US

Assignee:

Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G06N 3/00
G06N 3/12

US Classification:

706 13, 702 13, 703 10

Abstract:

A method utilizing genetic programming to construct history matching and forecasting proxies for reservoir simulators. Acting as surrogates for computer simulators, the genetic programming proxies evaluate a large number of reservoir models and predict future production forecasts for petroleum reservoirs.

US Patent:

7706981, Apr 27, 2010

Filed:

Feb 8, 2007

Appl. No.:

11/672925

Inventors:

David A. Wilkinson - Concord CA, US
Deyi Xie - San Ramon CA, US

Assignee:

Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G01V 1/00

US Classification:

702 14

Abstract:

The present invention incorporates the use of geophysical, geological and formation evaluation data to develop synthetic stratigraphic columns based on depositional rules and sedimentary stacking patterns. The present invention utilizes dynamic assignment and matching whereby the synthetic columns can be easily conformed throughout the reservation characterization process as geological data becomes available.

US Patent:

8090538, Jan 3, 2012

Filed:

May 1, 2008

Appl. No.:

12/113821

Inventors:

David A. Wilkinson - Concord CA, US
Tina Yu - St. John's, CA

Assignee:

Chevron U.S.A. Inc - San Ramon CA

International Classification:

G01V 5/12
G01V 5/10

US Classification:

702 8, 702 11

Abstract:

Well log data is assigned depositional labels by a soft computing method. A model is trained on an expert-interpreted well log by segmenting, assigning fuzzy symbols to the segments, and calculating attribute values for units labeled by the expert. From these values, classifiers are trained for each of a number of depositional types. Finally, a model is developed for translating fuzzy symbols into depositional labels. Once trained, the model is applied to well log data.

US Patent:

44782330, Oct 23, 1984

Filed:

Apr 25, 1983

Appl. No.:

6/460156

Inventors:

David E. Wilkinson - Fremont CA

International Classification:

A45D 4418

US Classification:

132 84D

Abstract:

A durable dental holder for a toothbrush and its combination with means for supporting a tube of toothpaste is described. The holder comprises a pivotably mounted flap having an opening for the passage of a toothbrush handle and a pair of longitudinal notches in the lower portion of its front wall for a gripping engagement with a flexible tube of toothpaste.

US Patent:

52844137, Feb 8, 1994

Filed:

Aug 5, 1992

Appl. No.:

7/925078

Inventors:

David Wilkinson - Danville CA
Donald Becker - Milpitas CA

Assignee:

Intelmatec Corporation - Fremont CA

International Classification:

H01L 2168
G01R 3100

US Classification:

414416

Abstract:

Carriers of a type, each with two elastically bendable holding pieces extending inwardly from its frame-like housing to hold a thin integrated circuit (IC) therebetween, are delivered to a specified pick-up location. A robotically operated pick-up module has a frame-like structure with windows, admits these carriers individually into these windows, and clamps them within these windows by means of an actuator-controlled clamping member. After they are brought to a transfer station having seats with openings connected to a negative pressure source, their holding pieces are pushed apart by activating another actuator within the module so as to move claw-like unlatching members. The ICs, which are then placed on the seats of the transfer station and released from their carriers, are picked up by vacuum suction pipes connected to vacuum pumps. While these ICs are suspended at bottom openings of these suction pipes, the module is robotically taken to a specified discharge location where the carriers, which are now empty, are released from their clamped conditions as the actuator-controlled clamping member is retracted. The ICs are thereafter brought to their desired positions and dropped off from the bottom openings of the suction pipes.

US Patent:

50006517, Mar 19, 1991

Filed:

Jan 29, 1990

Appl. No.:

7/471830

Inventors:

Minoru Akagawa - Fremont CA
Ryo Narisawa - Palo Alto CA
David Wilkinson - Dublin CA

Assignee:

Intelmatic Corporation - Fremont CA

International Classification:

B25J 1700

US Classification:

414741

Abstract:

A disk gripper has a rotary actuator with a horizontally supported shaft, a swing arm which is attached to and can rotate with this shaft and a finger arm which is connected to the swing arm such that the connected arms together extend radially from the shaft. Gripper fingers on the finger arm have mutually coplanar flat outer surfaces which point downward when the arms are in the horizontally extended position. The gripper fingers are provided with grooves and are movable toward or away from one another while their flat outer surfaces slidingly move over a horizontal support surface such that a disk lying on this surface can be engaged in these grooves or disengaged therefrom. The swing arm and the finger arm are slidable within a limited distance with respect to each other in a direction perpendicular to their extension. A spring applies a biasing force on the finger arm with respect to the swing arm such that, when the arms are in the horizontally extended position, the biasing force of the spring on the finger arm is in the downward direction.