Granted Patent
Utility
US 5,205,613 · App. 07/716,849
Tunnel boring machine with continuous forward propulsion
Inventor:
Howard K. Brown, JR.
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Jun 17, 1991
Inventor
Howard K. Brown, JR.
Assignee (at issue)
Robbins, 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.