Granted Patent
Utility
US 4,317,300 · App. 06/220,283
Earth working tooth with wear cap
Inventors:
Robert K. Emrich, William H. Prather, John M. Burkhart
Patented Case
View Patent ↗
Granted: Mar 2, 1982
Filed: Dec 29, 1980
Inventors
Robert K. Emrich
William H. Prather
John M. Burkhart
Assignee (at issue)
ESCO GROUP LLC
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.