Granted Patent
Utility
US 4,515,540 · App. 06/554,477
Variable liquid refrigerant injection port locator for screw compressor equipped with automatic variable volume ratio
Inventor:
Joseph W. Pillis
Patented Case
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Granted: May 7, 1985
Filed: Nov 22, 1983
Inventor
Joseph W. Pillis
Assignee (at issue)
Frick Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.