Granted Patent
Utility
US 5,798,422 · App. 08/511,809
Aromatic hydroxycarboxylic acid resins and their use
Inventors:
Akio Karasawa, Akihiro Yamaguchi, Keizaburo Yamaguchi, Yuko Ishihara
Patented Case
View Patent ↗
Granted: Aug 25, 1998
Filed: Aug 7, 1995
Inventors
Akio Karasawa
Akihiro Yamaguchi
Keizaburo Yamaguchi
Yuko Ishihara
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.