Granted Patent
Utility
US 4,285,684 · App. 05/927,569
Head for slitter-corrugator
Inventor:
Willis D. Smith
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jul 24, 1978
Inventor
Willis D. Smith
Assignee (at issue)
Tidland 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.