Granted Patent
Utility
US 4,295,768 · App. 06/077,664
Chip breaker screws
Inventor:
Edwin J. Skierski
Patented Case
View Patent ↗
Granted: Oct 20, 1981
Filed: Sep 21, 1979
Inventor
Edwin J. Skierski
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.