Granted Patent
Utility
US 4,412,297 · App. 06/193,980
Ultrasonic log scanning and orientation system
Inventors:
Darrell N. Halgrimson, Donald H. Hanson, Richard King
Patented Case
View Patent ↗
Granted: Oct 25, 1983
Filed: Oct 6, 1980
Inventors
Darrell N. Halgrimson
Donald H. Hanson
Richard King
Assignee (at issue)
Black Clawson Company, 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.