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2020-06-09 |
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2017-12-26 |
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System and method for controlling a variable speed drive of a compressor motor |
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2017-09-12 |
| 9664418 |
Variable volume screw compressors using proportional valve control |
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2017-05-30 |
| 9631620 |
Stationary volume ratio adjustment mechanism |
Timothy I. Auman |
2017-04-25 |
| 9032750 |
Manual Vi adjustment mechanism for screw compressors |
Angela Marie Comstock, Shahebaz Malik |
2015-05-19 |
| 8899942 |
Volume ratio control system and method |
William L. Kopko, Angela Marie Comstock |
2014-12-02 |
| 8888466 |
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2014-11-18 |
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2014-02-04 |
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2013-07-02 |
| 8444397 |
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| 8287248 |
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| 8267116 |
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Paul A. Huber |
2012-09-18 |
| 7854596 |
System and method of operation of multiple screw compressors with continuously variable speed to provide noise cancellation |
Harold Robert Schnetzka, E. Curtis Eichelberger |
2010-12-21 |
| 7413413 |
System and method to reduce acoustic noise in screw compressors |
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2008-08-19 |
| 7387498 |
System and method for noise attenuation of screw compressors |
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2008-06-17 |
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Capacity control for economizer refrigeration systems |
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2005-12-13 |
| 6409490 |
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2002-06-25 |
| 4678406 |
Variable volume ratio screw compressor with step control |
Joseph W. Pillis, David A. Murphy, Peter C. Spellar |
1987-07-07 |
| 4465446 |
Radial and thrust bearing mountings providing independent loading |
Joseph W. Pillis |
1984-08-14 |