Keith A. Engstrom

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River Grove, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Keyboard data entry system with hysteresis
- Patent number 4,704,601
- Issue date Nov 3, 1987
- Illinois Tool Works Inc.
- Keith A. Engstrom
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Enclosure for electrical data input apparatus
- Patent number 4,611,406
- Issue date Sep 16, 1986
- Illinois Tool Works Inc.
- Keith A. Engstrom
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
N-Key rollover keyboard
- Patent number 4,517,553
- Issue date May 14, 1985
- Illinois Tool Works Inc.
- Keith A. Engstrom
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Force transducer
- Patent number 4,479,392
- Issue date Oct 30, 1984
- Illinois Tool Works Inc.
- John W. Froeb
- G01 - MEASURING TESTING
Information Patent Grant
Keyboard with electronic hysteresis
- Patent number 4,390,866
- Issue date Jun 28, 1983
- Illinois Tool Works Inc.
- Keith A. Engstrom
- G11 - INFORMATION STORAGE
Information Patent Grant
Double depression magnetic keyswitch
- Patent number 4,028,696
- Issue date Jun 7, 1977
- Illinois Tool Works Inc.
- Robert Christen Madland
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Keyboard with N-key lockout and two-key rollover protection
- Patent number 3,978,474
- Issue date Aug 31, 1976
- Illinois Tool Works Inc.
- Keith Allen Engstrom
- H03 - BASIC ELECTRONIC CIRCUITRY