Granted Patent
Utility
US 5,256,019 · App. 07/980,728
Washerless self-captivating screw
Inventor:
Ronald W. Phillips, II
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Nov 24, 1992
Inventor
Ronald W. Phillips, II
Assignee (at issue)
Penn Engineering & Manufacturing Corp.
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.