Granted Patent
Utility
US 6,710,187 · App. 10/063,795
Process to isolate dianhydrides
Inventors:
Thomas Link Guggenheim, David Anthony Mongilio
Patented Case
View Patent ↗
Granted: Mar 23, 2004
Filed: May 14, 2002
Inventors
Thomas Link Guggenheim
David Anthony Mongilio
Assignee (at issue)
General Electric Company
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.