Granted Patent
Utility
US 5,031,487 · App. 07/537,243
Broken bolt extractor
Inventor:
Eli Polonsky
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Jun 13, 1990
Inventor
Eli Polonsky
Assignee (at issue)
Alden Corporation
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.