Granted Patent
Utility
US 4,874,457 · App. 07/184,516
Web corrugating apparatus
Inventor:
Morris K. Swieringa
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Apr 21, 1988
Inventor
Morris K. Swieringa
Assignee (at issue)
McNeil-PPC, 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.