Donald E. Allen

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Stillwater, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Continuous touch keyboard
- Patent number 5,486,058
- Issue date Jan 23, 1996
- Donald E. Allen
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Finger operated switching apparatus
- Patent number 4,769,516
- Issue date Sep 6, 1988
- Donald E. Allen
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Finger operated switching apparatus
- Patent number 4,761,522
- Issue date Aug 2, 1988
- Donald E. Allen
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS