Granted Patent
Utility
US 5,736,609 · App. 08/663,734
Sulfur-containing urethane-based resin composition, its resin, and optical element and lens comprising resin
Inventors:
Yoshihiro Irizato, Shinichi Umeda, Yoshinobu Kanemura, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Apr 7, 1998
Filed: Jun 14, 1996
Inventors
Yoshihiro Irizato
Shinichi Umeda
Yoshinobu Kanemura
Teruyuki Nagata
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.