Granted Patent
Utility
US 4,873,675 · App. 07/205,291
Method and apparatus for seismic exploration of strata surrounding a borehole
Inventors:
Frederick J. Barr, Thomas R. Beasley, Richard H. Piggin
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Jun 10, 1988
Inventors
Frederick J. Barr
Thomas R. Beasley
Richard H. Piggin
Assignee (at issue)
Halliburton Logging 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.