Granted Patent
Utility
US 4,727,488 · App. 07/035,216
Method and apparatus for detecting seismic events by identifying crossings in the Nth derivative of a waveform
Inventor:
Bruce E. Flinchbaugh
Patented Case
View Patent ↗
Granted: Feb 23, 1988
Filed: Apr 9, 1987
Inventor
Bruce E. Flinchbaugh
Assignee (at issue)
Texas Instruments Incorporated
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.