Granted Patent
Utility
US 5,819,487 · App. 08/816,853
Prestressed concrete poles with internal bolting and leveling structures
Inventors:
Steven Bull, William H. De Zavala
Patented Case
View Patent ↗
Granted: Oct 13, 1998
Filed: Mar 13, 1997
Inventors
Steven Bull
William H. De Zavala
Assignee (at issue)
AMERON INTERNATIONAL CORPORATION
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.