Granted Patent
Utility
US 4,405,178 · App. 06/263,480
Cutter bit for a mining machine
Inventor:
Helmut Brandenburg
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: May 14, 1981
Inventor
Helmut Brandenburg
Assignee (at issue)
Gebr. Eikhoff Maschinenfabrik u. Eisengiesserei mbH
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.