Granted Patent
Utility
US 5,840,965 · App. 08/899,093
Process for the production of purified telephthalic acid
Inventors:
John A. Turner, Eric Hindmarsh, David Parker, Ian Peter Milne
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Jul 23, 1997
Inventors
John A. Turner
Eric Hindmarsh
David Parker
Ian Peter Milne
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.