Granted Patent
Utility
US 4,553,286 · App. 06/602,029
Hinge preparation assembly for a steel door frame
Inventor:
Ernest D. Schwarz, II
Patented Case
View Patent ↗
Granted: Nov 19, 1985
Filed: Apr 19, 1984
Inventor
Ernest D. Schwarz, II
Assignee (at issue)
American Standard 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.