James Andrew Lyon

US Patent:

58322035, Nov 3, 1998

Filed:

Jan 23, 1995

Appl. No.:

8/377381

Inventors:

Franco Putzolu - San Francisco CA
Steven R. Pearson - Campbell CA
James M. Lyon - San Jose CA
Malcolm Mosher - Los Gatos CA

Assignee:

Tandem Computers Incorporated - San Jose CA

International Classification:

G06F 1100

US Classification:

39518218

Abstract:

An improved recovery method utilizes sequence numbers to order log records and reduce the excess compensating actions due to a failure during recovery. Next undo records are written to the log after a preset number of compensating actions which include the sequence number of the record currently being scanned. After a failure, all records between the next undo record and the record having the sequence number included in the next undo record are ignored during when the log is scanned backwards.

US Patent:

48192678, Apr 4, 1989

Filed:

Jun 9, 1987

Appl. No.:

7/062322

Inventors:

William P. Cargile - Half Moon Bay CA
Richard D. Freeman - Sunnyvale CA
James M. Lyon - San Jose CA

Assignee:

Thumbscan, Inc. - Oakbrook Terr. IL

International Classification:

H04L 904

US Classification:

380 23

Abstract:

A semiconductor device that functions as a key to control access to a computer or a software program resident in a computer or provides for secure communications is disclosed. The device executes an algorithm that combines a root and a seed to produce a password. The password is input to the computer. The computer uses an equivalent algorithm to produce a password within the computer. Comparison or other methods are employed to allow access to the computer or computer program or to allow for secure communications. The computer can be coded to produce on a video display thereof a time-space stimulus pattern which can be received by sensors of the key. Alternatively, a keypad can be employed to input the stimulus output from the computer into the access key. Further the present system allows for secure communication using algorithms between different computers and between distant locations.