Granted Patent
Utility
US 5,583,256 · App. 08/494,735
Process for producing 1,3-dialkyl-2-imidazolidinone
Inventors:
Hiroshi Naruse, Hideki Mizuta, Shinichi Umeda, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Dec 10, 1996
Filed: Jun 26, 1995
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.