Granted Patent
Utility
US 5,253,844 · App. 07/863,826
Hairpin spike pulling tool and machine therefor
Inventors:
Dennis J. Cotic, Jack K. Hosking
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Apr 6, 1992
Inventors
Dennis J. Cotic
Jack K. Hosking
Assignee (at issue)
Oak Industries 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.