Granted Patent
Utility
US 5,638,679 · App. 08/494,802
Hydraulic valve with dual-mode capability
Inventor:
Paul D. Richards
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Jun 26, 1995
Inventor
Paul D. Richards
Assignee (at issue)
IMO Industries 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.