Granted Patent
Utility
US 4,727,521 · App. 06/821,712
Seismic amplifier means and method
Inventors:
Herbert Meyer, Donald L. Howlett
Patented Case
View Patent ↗
Granted: Feb 23, 1988
Filed: Jan 23, 1986
Inventors
Herbert Meyer
Donald L. Howlett
Assignee (at issue)
Texaco 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.