Granted Patent
Utility
US 5,955,206 · App. 08/640,442
Polysulfide-based resin composition, polysulfide-based resin, and optical material comprising the resin
Inventors:
Koju Okazaki, Chitoshi Shimakawa, Mamoru Tanaka, Yoshinobu Kanemura, Teruyuki Nagata, Yoshihiro Irizato, Shinichi Umeda
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Apr 30, 1996
Inventors
Koju Okazaki
Chitoshi Shimakawa
Mamoru Tanaka
Yoshinobu Kanemura
Teruyuki Nagata
Yoshihiro Irizato
Shinichi Umeda
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.