Granted Patent
Utility
US 5,798,433 · App. 08/941,997
Process for production of polypropylene terephthalate
Inventors:
Wolfgang Schmidt, Ulrich Thiele, Stephanie Schauhoff, Dahai Yu
Patented Case
View Patent ↗
Granted: Aug 25, 1998
Filed: Oct 1, 1997
Inventors
Wolfgang Schmidt
Ulrich Thiele
Stephanie Schauhoff
Dahai Yu
Assignees (at issue)
Zimmer, Inc.
Degussa AG
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.