Granted Patent
Utility
US 5,203,857 · App. 07/775,866
Gas compressor head and discharge valve construction
Inventors:
Gerald L. Terwilliger, Robert D. Douglas, Prasanta K. Roy, Milton M. Kosfeld
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Oct 15, 1991
Inventors
Gerald L. Terwilliger
Robert D. Douglas
Prasanta K. Roy
Milton M. Kosfeld
Assignee (at issue)
Bristol Compressors, Inc.
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.