Granted Patent
Utility
US 4,888,224 · App. 07/259,484
Composite tubular elements and methods of fabrication
Inventors:
Barry L. Zackrisson, John A. Beckman
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Oct 17, 1988
Inventors
Barry L. Zackrisson
John A. Beckman
Assignee (at issue)
DANA LIMITED
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.