Granted Patent
Utility
US 6,420,033 · App. 09/225,453
Methods for the production of films
Inventors:
Uwe Numrich, Bernhard Schaefer
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Jan 6, 1999
Inventors
Uwe Numrich
Bernhard Schaefer
Assignee (at issue)
ROEHM GMBH & CO. KG
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.