Granted Patent
Utility
US 5,030,795 · App. 07/442,015
Low tension access hatch
Inventor:
Charles N. Domigan
Patented Case
View Patent ↗
Granted: Jul 9, 1991
Filed: Nov 28, 1989
Inventor
Charles N. Domigan
Assignee (at issue)
BUTLER MANUFACTURING 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.