Granted Patent
Utility
US 4,064,206 · App. 05/653,053
Process for forming flexible fold lines in thermoplastic sheets
Inventor:
Gerhard Seufert
Patented Case
View Patent ↗
Granted: Dec 20, 1977
Filed: Jan 28, 1976
Inventor
Gerhard Seufert
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.