Granted Patent
Utility
US 4,348,449 · App. 06/055,736
Process and apparatus for forming flexible fold lines in thermoplastic sheets
Inventor:
Gerhard Seufert
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: Jul 9, 1979
Inventor
Gerhard Seufert
Assignee (at issue)
Melvin B. Herrin
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.