Granted Patent
Utility
US 6,745,992 · App. 10/212,511
Pilot operated control valve having a poppet with integral pressure compensating mechanism
Inventors:
Xiaolong Yang, Michael J. Paik, Joseph L. Pfaff
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Aug 5, 2002
Inventors
Xiaolong Yang
Michael J. Paik
Joseph L. Pfaff
Assignee (at issue)
HUSCO International, 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.