Granted Patent
Utility
US 4,855,967 · App. 07/289,506
Seismic vibrator hold-down weight monitor/controller
Inventors:
John J. Sallas, Richard M. Weber, David S. Lamance
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Dec 22, 1988
Inventors
John J. Sallas
Richard M. Weber
David S. Lamance
Assignee (at issue)
Halliburton Geophysical Services, 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.