Granted Patent
Utility
US 4,459,234 · App. 06/154,929
Process for producing anthraquinone
Inventors:
Motoo Kawamata, Shiro Fujikake
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: May 30, 1980
Inventors
Motoo Kawamata
Shiro Fujikake
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.