Granted Patent
Utility
US 6,375,974 · App. 09/471,253
Process for producing aqueous solution of fumaric acid
Inventors:
Toshio Ito, Yukio Tanaka
Patented Case
View Patent ↗
Granted: Apr 23, 2002
Filed: Dec 23, 1999
Inventors
Toshio Ito
Yukio Tanaka
Assignee (at issue)
Mitsui Takeda 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.