Granted Patent
Utility
US 4,843,778 · App. 07/220,435
Elongated prestressed concrete tank and method of constructing same
Inventor:
Hugh E. Puder
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Jul 13, 1988
Inventor
Hugh E. Puder
Assignee (at issue)
CROM, LLC
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.