Granted Patent
Utility
US 4,657,456 · App. 06/613,579
Blind screw anchor
Inventor:
Robert Anquetin
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: May 24, 1984
Inventor
Robert Anquetin
Assignee (at issue)
USM Holding AG
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.