Granted Patent
Utility
US 5,678,643 · App. 08/544,723
Acoustic logging while drilling tool to determine bed boundaries
Inventors:
Carl A. Robbins, A. J. Mallett, John W. Minear, Batakrishna Mandal, James R. Birchak, Eugene J. Linyaev
Patented Case
View Patent ↗
Granted: Oct 21, 1997
Filed: Oct 18, 1995
Inventors
Carl A. Robbins
A. J. Mallett
John W. Minear
Batakrishna Mandal
James R. Birchak
Eugene J. Linyaev
Assignee (at issue)
Halliburton Energy 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.