Granted Patent
Utility
US 4,353,676 · App. 06/170,650
Bunker for tunnel boring
Inventors:
Henry V. Mikulich, Richard P. Lehmann
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Jul 21, 1980
Inventors
Henry V. Mikulich
Richard P. Lehmann
Assignee (at issue)
Lake Shore, 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.