Granted Patent
Utility
US 4,697,648 · App. 06/782,918
Spring-loaded suspension system for augers and screw anchors
Inventor:
Bernd Brandt
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Sep 24, 1985
Inventor
Bernd Brandt
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.