Granted Patent
Utility
US 6,574,652 · App. 09/193,774
Intrinsically safe communication and control system for use in hazardous locations including monotoring device with intrinsically safe fluorescent tube backlit
Inventor:
Alan Wayne Burkhard
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Nov 17, 1998
Inventor
Alan Wayne Burkhard
Assignee (at issue)
M-I L.L.C.
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.