Granted Patent
Utility
US 5,644,186 · App. 08/483,112
Acoustic Transducer for LWD tool
Inventors:
James R. Birchak, Eugene J. Linyaev, Carl A. Robbins, Dennis Roessler
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 7, 1995
Inventors
James R. Birchak
Eugene J. Linyaev
Carl A. Robbins
Dennis Roessler
Assignee (at issue)
Halliburton
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.