Granted Patent
Utility
US 4,973,758 · App. 07/439,757
Process for the preparation of 1,5-dihydroxynaphthalene and 1,5-diaminonaphthalene
Inventors:
Horst Behre, Lothar Jakob, Heinz U. Blank, Dietmar Mayer, Roland Busse
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Nov 21, 1989
Inventors
Horst Behre
Lothar Jakob
Heinz U. Blank
Dietmar Mayer
Roland Busse
Assignee (at issue)
Bayer Aktiengesellschaft
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.