Granted Patent
Utility
US 4,945,221 · App. 07/210,803
Apparatus and method for controlling a hydraulic excavator
Inventors:
Edward G. Nielsen, Timothy E. Steenwyk
Patented Case
View Patent ↗
Granted: Jul 31, 1990
Filed: Jun 24, 1988
Inventors
Edward G. Nielsen
Timothy E. Steenwyk
Assignee (at issue)
Laser Alignment, 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.