Granted Patent
Utility
US 4,993,351 · App. 07/409,655
Rounded top header extrusion for boat windshields
Inventors:
Albert W. Zirkelbach, Alan P. Zirkelbach, Donald A. Zirkelbach
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Sep 19, 1989
Inventors
Albert W. Zirkelbach
Alan P. Zirkelbach
Donald A. Zirkelbach
Assignee (at issue)
Aldon Industries, 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.