Granted Patent
Utility
US 5,359,075 · App. 07/924,875
Quinophthalone compound
Inventors:
Tsukasa Ohyama, Yasushi Shimokawa, Yoriaki Matsuzaki, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Aug 5, 1992
Inventors
Tsukasa Ohyama
Yasushi Shimokawa
Yoriaki Matsuzaki
Keisuke Takuma
Isamu Ghoda
Hitoshi Koshida
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.