Granted Patent
Utility
US 4,574,028 · App. 06/573,411
Apparatus for producing a corrugated sheet
Inventor:
Otto Hofer
Patented Case
View Patent ↗
Granted: Mar 4, 1986
Filed: Jan 24, 1984
Inventor
Otto Hofer
Assignee (at issue)
Interrondo AG
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.