Granted Patent
Utility
US 4,371,086 · App. 06/163,635
Support structures of excavating machines
Inventors:
Edwin W. Sankey, David J. Whittingham
Patented Case
View Patent ↗
Granted: Feb 1, 1983
Filed: Jun 27, 1980
Inventors
Edwin W. Sankey
David J. Whittingham
Assignee (at issue)
Dresser Industries, 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.