Granted Patent
Utility
US 4,668,793 · App. 06/794,034
Process for producing 1,3-dimethyl-2-imidazolidinone
Inventors:
Teruyuki Nagata, Nobuyuki Kajimoto, Masaru Wada, Hitoshi Nakayama, Tadao Yamada
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Nov 1, 1985
Inventors
Teruyuki Nagata
Nobuyuki Kajimoto
Masaru Wada
Hitoshi Nakayama
Tadao Yamada
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.