Granted Patent
Utility
US 4,385,189 · App. 06/227,667
Diphenyl ethers
Inventors:
Takeo Yoshimoto, Keiichi Igarashi, Kengo Oda, Masaaki Ura, Naoki Sato
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Jan 23, 1981
Inventors
Takeo Yoshimoto
Keiichi Igarashi
Kengo Oda
Masaaki Ura
Naoki Sato
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.