Granted Patent
Utility
US 4,774,872 · App. 06/818,203
Prestressed tube and tube joint
Inventor:
Richard L. Creedon
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Jan 13, 1986
Inventor
Richard L. Creedon
Assignee (at issue)
GA Technologies, 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.