Granted Patent
Utility
US 4,937,393 · App. 07/196,794
Method for preparing ethylene glycol and/or propylene glycol
Inventors:
Takayoshi Masuda, Katuyoshi Asano, Naomi Hori, Shinji Ando
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: May 17, 1988
Inventors
Takayoshi Masuda
Katuyoshi Asano
Naomi Hori
Shinji Ando
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.