Granted Patent
Utility
US 4,731,453 · App. 06/846,564
Process for producing 1, 3-dialkyl-2-imidazolidinone
Inventors:
Teruyuki Nagata, Nobuyuki Kajimoto, Masaru Wada, Hideki Mizuta, Akihiro Tamaki
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Mar 31, 1986
Inventors
Teruyuki Nagata
Nobuyuki Kajimoto
Masaru Wada
Hideki Mizuta
Akihiro Tamaki
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.