David Stuart Nichols

US Patent:

6338086, Jan 8, 2002

Filed:

Jun 11, 1998

Appl. No.:

09/096101

Inventors:

Pavel Curtis - Los Altos Hills CA
Michael D. Dixon - Palo Alto CA
David A. Nichols - Mountain View CA

Assignee:

Placeware, Inc. - Mountain View CA

International Classification:

G06F 1516

US Classification:

709218, 709203, 709205

Abstract:

A collaborative object architecture with one or more of the following technologies: 1) lightweight asynchronous messaging; 2) collaborative objects; 3) optimistic concurrency control; and 4) transparent object serialization. Lightweight asynchronous messaging allows highly responsive interactivity and natural interactions with minimal network loads. Collaborative objects allow ubiquitous sharing and provides each user with the same copy of the shared object. Optimistic concurrency control allows full-duplex group editing and natural interactions. Transparent object serialization provides real world persistence and support for asynchronous changes. Thus, combination of these technologies provides a collaborative object architecture with several advantages over the prior art.

US Patent:

6560707, May 6, 2003

Filed:

Jan 12, 1996

Appl. No.:

08/586136

Inventors:

Pavel Curtis - Los Altos Hills CA
Michael D. Dixon - Palo Alto CA
Ronald A. Frederick - Mountain View CA
David A. Nichols - Mountain View CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

H04L 900

US Classification:

713163, 713171, 380 33, 380257, 380281

Abstract:

In a network, a media coordination system provides secure multimedia communication channels in a collaborative network environment. The media coordination system provides automatic encryption, dynamic interconnection of streams of data, and user interface elements that provide users with control over the ultimate destination of their audio and video data. The infrastructure of the system includes a plurality of client workstations that are connected to a central server using point-to-point network connections. The central server maintains a persistent virtual world of network places with objects located therein. Streams of audio and video data are coordinated between client workstations operating in the persistent virtual world by a key manager object using channels, transmitters, and receivers. The client workstations multicast their audio and video data over the network to defined recipients after receiving a multicast address and an encryption key for a specific multicast channel. In order to protect the privacy of all communications and the integrity of the coordination system, each client workstation retains significant control over distribution and reception of audio and video data since multicast transmission is tied to specific user interface elements.

US Patent:

6772335, Aug 3, 2004

Filed:

Dec 6, 2001

Appl. No.:

10/004114

Inventors:

Pavel Curtis - Los Altos Hills CA
Michael D. Dixon - Palo Alto CA
Ronald A. Frederick - Mountain View CA
David A. Nichols - Mountain View CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

H04L 900

US Classification:

713163, 713162, 370236, 370432, 380279, 345716, 345737, 345738, 345748, 345756, 345764, 345747

Abstract:

In a network, a media coordination system provides secure multimedia communication channels in a collaborative network environment. The media coordination system provides automatic encryption, dynamic interconnection of streams of data, and user interface elements that provide users with control over the ultimate destination of their audio and video data. The infrastructure of the system includes a plurality of client workstations that are connected to a central server using point-to-point network connections. The central server maintains a persistent virtual world of network places with objects located therein. Streams of audio and video data are coordinated between client workstations operating in the persistent virtual world by a key manager object using channels, transmitters, and receivers. The client workstations multicast their audio and video data over the network to defined recipients after receiving a multicast address and an encryption key for a specific multicast channel. In order to protect the privacy of all communications and the integrity of the coordination system, each client workstation retains significant control over distribution and reception of audio and video data since multicast transmission is tied to specific user interface elements.

US Patent:

20020052932, May 2, 2002

Filed:

Nov 27, 2001

Appl. No.:

09/993639

Inventors:

Pavel Curtis - Los Altos Hills CA, US
Micheal Dixon - Palo Alto CA, US
David Nichols - Mountain View CA, US

Assignee:

PlaceWare, Inc.

International Classification:

G06F015/16
G06F009/44

US Classification:

709/218000, 709/315000

Abstract:

A collaborative object architecture with one or more of the following technologies: 1) lightweight asynchronous messaging; 2) collaborative objects; 3) optimistic concurrency control; and 4) transparent object serialization. Lightweight asynchronous messaging allows highly responsive interactivity and natural interactions with minimal network loads. Collaborative objects allow ubiquitous sharing and provides each user with the same copy of the shared object. Optimistic concurrency control allows full-duplex group editing and natural interactions. Transparent object serialization provides real world persistence and support for asynchronous changes. Thus, combination of these technologies provides a collaborative object architecture with several advantages over the prior art.

US Patent:

20130107665, May 2, 2013

Filed:

Nov 1, 2011

Appl. No.:

13/286574

Inventors:

ROBIN FLETCHER - Guildford, GB
David Nichols - Palo Alto CA, US
Maud Cavalca - Redhill, GB

International Classification:

G01V 1/36

US Classification:

367 43

Abstract:

Computing systems and methods for improving imaging of collected data are disclosed. In one embodiment, a first wavefield is propagated to obtain a first wavefield history; the first wavefield is again propagated to obtain a second wavefield history, wherein the propagation includes integration of one or more Q-effects; a first attenuated traveltime history is estimated based at least in part on the first and second wavefield histories; a first Q-model filter is calculated based at least in part on the first estimated attenuated traveltime; and a first adjusted wavefield is generated based at least in part on application of the first Q-model filter to the first wavefield. In some embodiments, an image is generated based at least on a first adjusted wavefield and a second wavefield.

US Patent:

20130185032, Jul 18, 2013

Filed:

Aug 20, 2012

Appl. No.:

13/589478

Inventors:

STEWART ARCHER - HAYSWOODS HEATH, GB
ROBIN FLETCHER - GUILDFORD, GB
WEIJIAN MAO - KINGSTON UPON THAMES, GB
DAVID NICHOLS - PALO ALTO CA, US

Assignee:

WESTERNGECO L.L.C. - HOUSTON TX

International Classification:

G06F 17/50

US Classification:

703 2

Abstract:

A technique includes determining at least one impulse response of a modeling and migration of at least one point scatterer in a target structure and based at least in part on the impulse response(s) and a reflection amplitude image, determining a model for at least part of the target structure.

US Patent:

20130265852, Oct 10, 2013

Filed:

Nov 1, 2012

Appl. No.:

13/666801

Inventors:

DAVID NICHOLS - PALO ALTO CA, US

Assignee:

WESTERNGECO L.L.C. - HOUSTON TX

International Classification:

G01V 1/32

US Classification:

367 73

Abstract:

Acquired data that corresponds at least in part to a target structure is received. One or more subsets of a first type are formed from the acquired data. The one or more subsets of the first type are converted to one or more subsets of a second, different type.

US Patent:

54956005, Feb 27, 1996

Filed:

Jun 3, 1992

Appl. No.:

7/892869

Inventors:

Douglas B. Terry - San Carlos CA
David Goldberg - Palo Alto CA
David A. Nichols - Mountain View CA
Brian M. Oki - Mountain View CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06F 1730

US Classification:

395600

Abstract:

To produce a continuous query for an append-only database, a client defined query first is converted into its minimal bounding non-decreasing monotone (hereinafter referred to as "monotonic increasing" query. This monotonic query, in turn, is converted into an incremental query, The resulting monotonically increasing incremental query then is installed on the database as a stored procedure that takes two date/time parameters (hereinafter referred to as "time" parameters), one of which (. tau. ) identifies the last time the procedure was executed, and the other of which (t) identifies the current time. All database records are timestamped as of the time that they are entered into the database. Thus, in operation, more or less standard procedure calls periodically invoke each of the stored query procedures, thereby periodically executing the incremental queries over database records that have timestamps spanning successive time slots.