Granted Patent
Utility
US 4,898,036 · App. 07/005,830
Flow responsive transmitter and indicator
Inventor:
Tommy L. Gray
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Jan 21, 1987
Inventor
Tommy L. Gray
Assignee (at issue)
Span Instruments, 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.