Granted Patent
Utility
US 5,046,905 · App. 07/376,325
Winged drill screw
Inventors:
Frank Piacenti, Steven N. Flinchum
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: Jul 6, 1989
Inventors
Frank Piacenti
Steven N. Flinchum
Assignee (at issue)
Emhart 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.