Granted Patent
Utility
US 5,178,887 · App. 07/683,303
Compound fluted mold for casting prestressed concrete lamp poles
Inventors:
James F. O'Conner, William A. Muller
Patented Case
View Patent ↗
Granted: Jan 12, 1993
Filed: Apr 10, 1991
Inventors
James F. O'Conner
William A. Muller
Assignee (at issue)
Ameron, 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.