John J. Rohulich

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Cambridge, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Speaker volume control apparatus and method
- Patent number 4,797,932
- Issue date Jan 10, 1989
- NCR Corporation
- John J. Rohulich
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Sound generating system for a keyboard
- Patent number 4,694,725
- Issue date Sep 22, 1987
- NCR Corporation
- Daniel B. Seevers
- G06 - COMPUTING CALCULATING COUNTING