Granted Patent
Utility
US 5,720,580 · App. 08/577,806
Apparatus for and method of shoring a trench
Inventor:
Dieter Ryhsen
Patented Case
View Patent ↗
Granted: Feb 24, 1998
Filed: Dec 22, 1995
Inventor
Dieter Ryhsen
Assignee (at issue)
KVH Verbautechnik GmbH
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.