Peter C. Spellar

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Hagerstown, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Variable volume ratio screw compressor with step control
- Patent number 4,678,406
- Issue date Jul 7, 1987
- Frick Company
- Joseph W. Pillis
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Micro-processor control of compression ratio at full load in a heli...
- Patent number 4,548,549
- Issue date Oct 22, 1985
- Frick Company
- David A. Murphy
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Micro-processor control of compression ratio at full load in a heli...
- Patent number 4,519,748
- Issue date May 28, 1985
- Frick Company
- David A. Murphy
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Micro-processor control of moveable slide stop and a moveable slide...
- Patent number 4,516,914
- Issue date May 14, 1985
- Frick Company
- David A. Murphy
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...