Granted Patent
Utility
US 6,002,004 · App. 09/007,196
Pyrrolodiazine derivatives as stabilizers for chilorine-containing polymers
Inventors:
Wolfgang Wehner, Hans-Helmut Friedrich, Rolf Drewes
Patented Case
View Patent ↗
Granted: Dec 14, 1999
Filed: Jan 14, 1998
Inventors
Wolfgang Wehner
Hans-Helmut Friedrich
Rolf Drewes
Assignee (at issue)
Witco Vinyl Additives 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.