Granted Patent
Utility
US 6,536,601 · App. 09/423,600
Sludge silo
Inventors:
Wolfgang Zey, Alexander Schmid
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Nov 10, 1999
Inventors
Wolfgang Zey
Alexander Schmid
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.