Thomas L Siwecki

US Patent:

49742132, Nov 27, 1990

Filed:

Mar 20, 1989

Appl. No.:

7/326508

Inventors:

Thomas L. Siwecki - Danville CA

International Classification:

G01S 1500

US Classification:

367 88

Abstract:

A three-dimensional large scale rectilinear array of hydrophones comprising a plurality of equally spaced, fixed position, omni-directional, electro-acoustic transducers, utilizes aperture steering circuits to create a polar coordinate map indicating the bearing and elevation of incoming sound signals. The attitude and depth of the array is controlled by an array maneuvering system to position the array for maximum signal strength and to rotate the array to a horizontal position for maneuvering in shallow water. The geometric configuration combined with digital signal processing circuits provide improved sound detection threshold over linear and single planar arrays. An acoustically transparent housing is used to enclose the array. The shape of the housing and supporting structural frame are adapted to limit self-induced background noise. The hydrophones are also alternately connected to circuits for activating the hydrophone array to produce a low frequency (100 to 1000 Hz) frequency sound pulse defining a beam having a predetermined vertical and horizontal solid angle and predetermined bearing and azimuth.

US Patent:

43338321, Jun 8, 1982

Filed:

Aug 29, 1977

Appl. No.:

5/828903

Inventors:

Thomas L. Siwecki - Walnut Creek CA
Gerry B. Andeen - Menlo Park CA

International Classification:

B01D 3100

US Classification:

2101952

Abstract:

Salt water and other solutions are accelerated in a rotating structure and applied to a cannister containing reverse osmosis membrane material. The desalinated water is removed after passing through the large surface area concentration of membrane material in the cannister. The enriched brine is removed from the cannister at a point furthest from the axis of the rotating structure and returned to the vicinity of the axis to prevent the buildup of dense material. The membrane material is configured in the cannister so that the flow is generally radially with respect to the axis of the rotating structure.

US Patent:

44109687, Oct 18, 1983

Filed:

Sep 16, 1980

Appl. No.:

6/187779

Inventors:

Hugh F. Frohbach - Sunnyvale CA
Robert E. Myers - Menlo Park CA
Norman A. Peppers - Belmont CA
Thomas L. Siwecki - Walnut Creek CA
Louis F. Schaefer - Palo Alto CA

International Classification:

G11B 700

US Classification:

369 44

Abstract:

Information is stored, using a relatively low-power light beam, by redistributing the material in a deformable film. In a disc configuration, positioning of the light beam is achieved by referencing to a previously recorded track. In a document storage and retrieval system the document is scanned with the resultant scanned signal modulating the writing light beam producing a recorded track. This track is optically read with the resultant signal applied to a printer. For optimum utilization of the area, the recording and readout take place at constant velocity.

US Patent:

43108474, Jan 12, 1982

Filed:

Aug 4, 1978

Appl. No.:

5/930984

Inventors:

Hugh F. Frohbach - Sunnyvale CA
Albert Macovski - Menlo Park CA
Norman A. Peppers - Belmont CA
Thomas L. Siwecki - Walnut Creek CA
Louis F. Schaefer - Palo Alto CA

Assignee:

World Development Laboratories - Los Angeles CA

International Classification:

H04N 904

US Classification:

358 54

Abstract:

A color image is recorded on film at the television field rate. A portion of the film is illuminated, corresponding to a line in the color image, and decomposed into its component colors. The decomposed light from the line is imaged onto two or more line scanning photosensitive arrays which provide scanned signals. These scanned signals are decoded and used to provide the standard color television signals.

US Patent:

42610079, Apr 7, 1981

Filed:

Jun 4, 1979

Appl. No.:

6/045179

Inventors:

Hugh F. Frohbach - Sunnyvale CA
Robert E. Myers - Menlo Park CA
Norman A. Peppers - Belmont CA
Thomas L. Siwecki - Walnut Creek CA
Louis F. Schaefer - Palo Alto CA
Albert Macovski - Menlo Park CA

Assignee:

Laser-File Inc. - Los Angeles CA

International Classification:

H04N 588

US Classification:

358 5

Abstract:

A color image is recorded on film at the television field rate with alternate film frames representing the luminance and chrominance information. The chrominance information is encoded by filtering the color image through a striped color filter. On playback two line scanners are used to simultaneously scan the luminance and chrominance frames to provide the desired information simultaneously. A decoding signal is used to decode the encoded chrominance information and derive color-difference signals.