Granted Patent
Utility
US 4,224,243 · App. 06/049,604
Process for producing dimethyl formamide
Inventors:
Tetsuo Aoyama, Shigeru Horie, Kozo Sano, Hidetaka Kiga, Kinichi Mizuno, Takeo Ikarashi
Patented Case
View Patent ↗
Granted: Sep 23, 1980
Filed: Jun 18, 1979
Inventors
Tetsuo Aoyama
Shigeru Horie
Kozo Sano
Hidetaka Kiga
Kinichi Mizuno
Takeo Ikarashi
Assignee (at issue)
MITSUBISHI GAS CHEMICAL COMPANY, INC.
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.