Granted Patent
Utility
US 4,657,307 · App. 06/809,044
Concrete pavement breaker
Inventors:
Charles L. Staley, John R. Harms, Ronald L. Anderson
Patented Case
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Granted: Apr 14, 1987
Filed: Dec 16, 1985
Inventors
Charles L. Staley
John R. Harms
Ronald L. Anderson
Assignee (at issue)
J. I. Case Company
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.