Granted Patent
Utility
US 4,244,447 · App. 06/001,711
Mobile power crane-excavator with open gear greasing
Inventor:
John R. Hanitz
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Jan 8, 1979
Inventor
John R. Hanitz
Assignee (at issue)
Northwest Engineering 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.