Granted Patent
Utility
US 6,809,174 · App. 10/678,365
Process for reclaiming residual ethylene in the preparation of vinyl ethylene copolymers
Inventors:
Hans-Peter Weitzel, Robert Braunsperger
Patented Case
View Patent ↗
Granted: Oct 26, 2004
Filed: Oct 3, 2003
Inventors
Hans-Peter Weitzel
Robert Braunsperger
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.