Granted Patent
Utility
US 4,231,699 · App. 06/006,552
Lower and crawler frame construction for crawler propelled machines
Inventor:
George J. Thompson
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Jan 24, 1979
Inventor
George J. Thompson
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.