Granted Patent
Utility
US 6,823,686 · App. 10/194,501
Pressure equalization system and method
Inventors:
Eugene Chumley, Larry Pippin, Pantelis Hatzikazakis, William Z. Sun, Timothy Wampler, Charles E. Zimmerman, Rongchang Xin, David Monk
Patented Case
View Patent ↗
Granted: Nov 30, 2004
Filed: Jul 12, 2002
Inventors
Eugene Chumley
Larry Pippin
Pantelis Hatzikazakis
William Z. Sun
Timothy Wampler
Charles E. Zimmerman
Rongchang Xin
David Monk
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.