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| Patents for Orville W. Ehrhardt | |||||
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| Number | Title | Classification(s) | |||
| 3,857,051 | Rotary Position Transducer Assembly Using Hydrostatic Bearings | 310/36, 310/90, 318/653 | |||
| 3,988,965 | Two Pressure Counterbalance System for Machine Tool Headstocks | 408/239R, 409/237 | |||
| 4,080,009 | Servostatic Bearing System With Variable Stiffness | 108/143, 108/20, 384/12, 384/15 | |||