Granted Patent
Utility
US 4,648,660 · App. 06/727,682
Method and apparatus for mining machine cutter head
Inventors:
John P. Mann, Victor M. Levenstein, Charles H. Fox
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Apr 26, 1985
Inventors
John P. Mann
Victor M. Levenstein
Charles H. Fox
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.