Granted Patent
Utility
US 4,248,611 · App. 06/037,965
Mining machine
Inventors:
Robert C. McGuire, John J. Belcher, Jr.
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: May 10, 1979
Inventors
Robert C. McGuire
John J. Belcher, Jr.
Assignee (at issue)
Dresser Industries, Inc.
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.