Granted Patent
Utility
US 4,842,923 · App. 07/078,429
Ballistic materials
Inventor:
David R. Hartman
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Jul 27, 1987
Inventor
David R. Hartman
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.