Granted Patent
Utility
US 4,426,029 · App. 06/335,615
Safety blade for severing stretchable film
Inventor:
Ewald A. Kamp
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Dec 30, 1981
Inventor
Ewald A. Kamp
Assignee (at issue)
Union Carbide 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.