Granted Patent
Utility
US 4,561,821 · App. 06/684,342
Portable self-erecting surge storage silo
Inventor:
Bruce A. Dillman
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: Dec 20, 1984
Inventor
Bruce A. Dillman
Assignee (at issue)
Bituma-Stor, 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.