Granted Patent
Utility
US 5,574,172 · App. 08/250,787
Process for producing halogenated phthalic anhydride
Inventors:
Yoshio Katsuro, Hitoshi Matsuda
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: May 26, 1994
Inventors
Yoshio Katsuro
Hitoshi Matsuda
Assignee (at issue)
MITSUBISHI CHEMICAL CORPORATION
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.