Granted Patent
Utility
US 5,170,657 · App. 07/817,946
Temperature compensated methods for detection of leaks in pressurized pipeline systems
Patented Case
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Granted: Dec 15, 1992
Filed: Jan 3, 1992
Assignee (at issue)
VISTA RESEARCH GROUP, LLC
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.