Granted Patent
Utility
US 5,980,156 · App. 09/092,984
Tunnel liner building method and building panels therefor
Inventors:
Frederick Morello, David B. Berkey
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Jun 8, 1998
Inventors
Frederick Morello
David B. Berkey
Assignee (at issue)
M.I.C. 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.