Granted Patent
Utility
US 6,776,558 · App. 10/149,182
Method and arrangement for concreting vertical shafts
Inventor:
Rolf Dose
Patented Case
View Patent ↗
Granted: Aug 17, 2004
Filed: Sep 9, 2002
Inventor
Rolf Dose
Assignee (at issue)
PUTZMEISTER 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.