Granted Patent
Utility
US 4,601,221 · App. 06/670,419
Clamping device for rectangular workpiece
Inventors:
Ralph W. Kalkbrenner, Hans E. Leumann
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Nov 9, 1984
Inventors
Ralph W. Kalkbrenner
Hans E. Leumann
Assignee (at issue)
Westinghouse Electric Company LLC
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.