Granted Patent
Utility
US 6,237,423 · App. 09/269,775
Method and device to determine delivery rate or mass flow rate of material conveyed by a high density liquid piston pump
Inventor:
Wolfgang Zey
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Mar 31, 1999
Inventor
Wolfgang Zey
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.