Granted Patent
Utility
US 5,872,260 · App. 08/897,768
High purity 1,3-dialkyl-2-imidazolidinone and preparation process of same
Inventors:
Hideki Mizuta, Masazumi Takaoka, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: Jul 21, 1997
Inventors
Hideki Mizuta
Masazumi Takaoka
Teruyuki Nagata
Assignee (at issue)
MITSUI CHEMICALS, INC.
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.