Granted Patent
Utility
US 4,628,091 · App. 06/620,398
Process for producing dianthraquinone-N,N'-dihydrazine and its chlorination product
Inventors:
Kimitoshi Kato, Hiroshi Aiga, Tamio Mikoda, Tunehiro Sakai
Patented Case
View Patent ↗
Granted: Dec 9, 1986
Filed: Jun 13, 1984
Inventors
Kimitoshi Kato
Hiroshi Aiga
Tamio Mikoda
Tunehiro Sakai
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.