Granted Patent
Utility
US 5,188,485 · App. 07/717,239
Foundation pile of reinforced concrete
Inventors:
Richard F. Forster, Friedemann A. Rudersdorf
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Jun 18, 1991
Inventors
Richard F. Forster
Friedemann A. Rudersdorf
Assignee (at issue)
Pfleiderer Verkehrstechnik 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.