Granted Patent
Utility
US 5,384,346 · App. 08/058,896
Polyvinyl butyrals having improved thermal stability and light resistance
Inventors:
Matthas Gutweiler, Ulrich M. Hutten, Gerhard Pfahler, Hermann Schindler
Patented Case
View Patent ↗
Granted: Jan 24, 1995
Filed: May 6, 1993
Inventors
Matthas Gutweiler
Ulrich M. Hutten
Gerhard Pfahler
Hermann Schindler
Assignee (at issue)
Hoechst GmbH
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.