Granted Patent
Utility
US 4,307,790 · App. 05/891,276
Weight-drop seismic exploration system
Inventors:
Tawassul Ali Khan, David Kratochvil
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Mar 29, 1978
Inventors
Tawassul Ali Khan
David Kratochvil
Assignee (at issue)
Geosource, 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.