Granted Patent
Utility
US 6,734,246 · App. 10/040,675
Polyvinylacetal-grafted polymers
Inventors:
Hans-Peter Weitzel, Peter Ball, Peter Tschirner
Patented Case
View Patent ↗
Granted: May 11, 2004
Filed: Nov 9, 2001
Inventors
Hans-Peter Weitzel
Peter Ball
Peter Tschirner
Assignee (at issue)
WACKER POLYMER SYSTEMS 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.