Christopher P Rosebrugh

US Patent:

56301685, May 13, 1997

Filed:

Oct 27, 1992

Appl. No.:

7/966996

Inventors:

Christopher Rosebrugh - Lake Oswego OR
Jin H. Kim - Beaverton OR

Assignee:

PI Systems Corporation - Portland OR

International Classification:

G06F 1740
G06K 922

US Classification:

395825

Abstract:

An object oriented database data acquisition device having a housing with at least one substantially planar surface and a video screen positioned thereon. The device includes a digitizer positioned substantially coextensively under the video screen and a pen having a power source for activating the digitizer. Means for controlling the data acquisition device includes controllers comprising a first microprocessor, a second microprocessor connected to said digitizer and first processor for scanning the digitizer, a third microprocessor connected to said video screen for controlling screen images, a power manager connected to the first processor, the power manager including a power source and controller, program storage, and a program stored in the program storage for controlling the microprocessors.

US Patent:

51426765, Aug 25, 1992

Filed:

Dec 28, 1988

Appl. No.:

7/291070

Inventors:

Jeffrey A. Fried - Somerville MA
Christopher P. Rosebrugh - Lake Oswego OR

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

G06F 1214
G06F 1200

US Classification:

395425

Abstract:

A locking circuit for controlling access to locked segments of a shared memory includes a content-addressable memory for storing addresses of the locked memory segments and for simultaneously comparing a target address with the addresses of the locked memory segments and providing a match signal when the target address matches one of the addresses of the locked memory segments. During a memory access cycle, a target address is supplied to the content-addressable memory, and a control circuit is responsive to the match signal to inhibit completion of the memory access cycle. A locking ID, which identifies the processor or process that locked the memory segment, is stored in a second memory. During a memory access cycle, a requesting ID is compared with the locking ID of the locked segment which produced the match signal. When the locking ID and the requesting ID match, the memory access cycle is enabled.

US Patent:

D3463664, Apr 26, 1994

Filed:

Aug 28, 1992

Appl. No.:

7/937483

Inventors:

Jin H. Kim - Beaverton OR
Christopher Rosebrugh - Lake Oswego OR
Dean Bidwell - Auburn WA

Assignee:

PI Systems Corporation - Portland OR

US Classification:

D14100