Granted Patent
Utility
US 4,867,073 · App. 07/169,458
Internal drainage system for hollow member structural assembly and method
Inventor:
Richard H. Dugge
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Mar 17, 1988
Inventor
Richard H. Dugge
Assignee (at issue)
ACF Industries Incorporated
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.