Granted Patent
Utility
US 4,322,176 · App. 06/149,756
Tubular beam joint
Inventor:
Alfred L. Johnson, Jr.
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: May 14, 1980
Inventor
Alfred L. Johnson, Jr.
Assignee (at issue)
LaJet Energy Company
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.