Granted Patent
Utility
US 4,330,748 · App. 06/033,013
Frequency correction circuitry for pipeline sensor apparatus
Inventor:
Ernest Holden
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Apr 24, 1979
Inventor
Ernest Holden
Assignee (at issue)
British Gas
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.