Granted Patent
Utility
US 4,840,200 · App. 07/110,211
Prestressed tube
Inventor:
Richard L. Creedon
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Oct 19, 1987
Inventor
Richard L. Creedon
Assignee (at issue)
General Atomics
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.