Granted Patent
Utility
US 5,203,614 · App. 07/716,847
Tunneling machine having liquid balance low flow slurry system
Inventors:
Richard J. Robbins, David T. Cass, Peter B. Dowden
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Jun 17, 1991
Inventors
Richard J. Robbins
David T. Cass
Peter B. Dowden
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.