Granted Patent
Utility
US 5,652,321 · App. 08/550,352
Composition for optical materials and use thereof
Inventors:
Nobuya Kawauchi, Katsuyoshi Sasagawa, Seiichi Kobayashi
Patented Case
View Patent ↗
Granted: Jul 29, 1997
Filed: Oct 30, 1995
Inventors
Nobuya Kawauchi
Katsuyoshi Sasagawa
Seiichi Kobayashi
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.