Granted Patent
Utility
US 4,604,917 · App. 06/710,675
Easy-out threaded fastener extractor
Inventor:
Eli Polonsky
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Mar 12, 1985
Inventor
Eli Polonsky
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.