Granted Patent
Utility
US 5,594,149 · App. 08/633,533
Process for producing 1,3-dialkyl-2-imidazolidinone
Inventors:
Hiroshi Naruse, Hideki Mizuta, Shinichi Umeda, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Jan 14, 1997
Filed: Apr 17, 1996
Inventors
Hiroshi Naruse
Hideki Mizuta
Shinichi Umeda
Teruyuki Nagata
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.