Granted Patent
Utility
US 4,625,372 · App. 06/714,792
Apparatus for the manufacture of biaxially stretched flat film
Inventors:
Walter Hufnagel, Volker Graap, deceased, Freidrich von und zu Aufsess, Rotger Armsen
Patented Case
View Patent ↗
Granted: Dec 2, 1986
Filed: Mar 22, 1985
Inventors
Walter Hufnagel
Volker Graap, deceased
Freidrich von und zu Aufsess
Rotger Armsen
Assignee (at issue)
Internationale Otrool Maatschappij Octropa B.V.
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.