Granted Patent
Utility
US 4,557,339 · App. 06/454,591
Borehole conditioning apparatus
Inventors:
Charles L. Falknor, Vincent H. Vetter, Dale R. Wolfer, Dalton K. Lyon
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Dec 30, 1982
Inventors
Charles L. Falknor
Vincent H. Vetter
Dale R. Wolfer
Dalton K. Lyon
Assignee (at issue)
Hughes Tool Company LLC
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.