Granted Patent
Utility
US 4,422,586 · App. 06/325,445
Method and apparatus for roll changing
Inventor:
Richard S. Tetro
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Nov 27, 1981
Inventor
Richard S. Tetro
Assignee (at issue)
Black Clawson Company, 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.