Granted Patent
Utility
US 4,454,978 · App. 06/491,250
Process for improved manufacture of shells for tunnel tubes
Inventors:
Joseph J. Schneider, Robert August Kaucic
Patented Case
View Patent ↗
Granted: Jun 19, 1984
Filed: May 3, 1983
Inventors
Joseph J. Schneider
Robert August Kaucic
Assignee (at issue)
AMCA International Corporation
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.