Granted Patent
Utility
US 4,723,046 · App. 07/062,674
Process for the preparation of 4,4'-biphenol
Inventors:
Teruyuki Nagata, Tohru Miura
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Jun 16, 1987
Inventors
Teruyuki Nagata
Tohru Miura
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.