Granted Patent
Utility
US 5,683,503 · App. 08/720,506
Composition for and method of pumping concrete
Inventor:
Daniel P. Montgomery
Patented Case
View Patent ↗
Granted: Nov 4, 1997
Filed: Sep 17, 1996
Inventor
Daniel P. Montgomery
Assignee (at issue)
FRITZ INDUSTRIES, 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.