Granted Patent
Utility
US 4,484,008 · App. 06/430,107
Process improvement for diphenyl ether production
Inventors:
James A. Cook, Jr., James A. Manner
Patented Case
View Patent ↗
Granted: Nov 20, 1984
Filed: Sep 30, 1982
Inventors
James A. Cook, Jr.
James A. Manner
Assignee (at issue)
PPG Industries, Inc.
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.