Granted Patent
Utility
US 6,387,989 · App. 09/743,276
Hardeners for epoxy resins, processes for producing the same and methods of using the same
Inventors:
Horst Sulzbach, Thomas Huver, Hans-Josef Thomas, Vincenzo Foglianisi
Patented Case
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Granted: May 14, 2002
Filed: May 1, 2001
Inventors
Horst Sulzbach
Thomas Huver
Hans-Josef Thomas
Vincenzo Foglianisi
Assignee (at issue)
Cognis Deutschland 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.