Granted Patent
Utility
US 4,179,252 · App. 05/830,536
Apparatus for forming flexible fold lines in thermoplastic sheets and article so formed
Inventor:
Gerhard Seufert
Patented Case
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Granted: Dec 18, 1979
Filed: Sep 6, 1977
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.