David P. Ratcliffe

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Bristolville, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
System for checking the calibration of gravimetic feeders and belt...
- Patent number 5,877,456
- Issue date Mar 2, 1999
- General Signal Corporation
- John C. Homer
- G01 - MEASURING TESTING
Information Patent Grant
System for checking the calibration of gravimetric feeders and belt...
- Patent number 5,686,653
- Issue date Nov 11, 1997
- General Signal Corporation
- John C. Homer
- G01 - MEASURING TESTING