Granted Patent
Utility
US 5,772,977 · App. 08/549,586
Anthraquinone process
Inventors:
Colie Lawrence Jenkins, Fred Bronson Kirby, Theodore A. Koch
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Oct 27, 1995
Inventors
Colie Lawrence Jenkins
Fred Bronson Kirby
Theodore A. Koch
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.