Granted Patent
Utility
US 4,014,574 · App. 05/566,986
Mining machine having rectangular thrust transmitting conveyor column
Inventor:
Robert Edmund Todd
Patented Case
View Patent ↗
Granted: Mar 29, 1977
Filed: Apr 10, 1975
Inventor
Robert Edmund Todd
Assignee (at issue)
BROWNIN BUSHMAN P.C.
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.