Granted Patent
Utility
US 6,040,111 · App. 08/993,657
Aromatic hydroxycarboxylic acid resins and their use
Inventors:
Akio Karasawa, Akihiro Yamaguchi, Keizaburo Yamaguchi, Yuko Ishihara
Patented Case
View Patent ↗
Granted: Mar 21, 2000
Filed: Dec 18, 1997
Inventors
Akio Karasawa
Akihiro Yamaguchi
Keizaburo Yamaguchi
Yuko Ishihara
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.