Granted Patent
Utility
US 5,941,372 · App. 09/190,998
Push button switching system and method
Inventor:
Mervyn Johnston
Patented Case
View Patent ↗
Granted: Aug 24, 1999
Filed: Nov 12, 1998
Inventor
Mervyn Johnston
Assignee (at issue)
Dresser 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.