Granted Patent
Utility
US 4,246,979 · App. 06/027,198
Internal sleeve air release control apparatus in seismic air gun
Inventors:
John T. Thomson, Roy Johnston
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Apr 5, 1979
Inventors
John T. Thomson
Roy Johnston
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.