Granted Patent
Utility
US 4,051,178 · App. 05/694,361
Process for producing terephthalic acid
Inventors:
Tsuneo Kimura, Hiroshi Hashizume, Yoshiaki Izumisawa
Patented Case
View Patent ↗
Granted: Sep 27, 1977
Filed: Jun 9, 1976
Inventors
Tsuneo Kimura
Hiroshi Hashizume
Yoshiaki Izumisawa
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.