Granted Patent
Utility
US 5,693,738 · App. 08/413,113
Composition for urethane-base plastic lens, urethane-base plastic lens obtained from the composition, and process for the production of the plastic lens
Inventors:
Koju Okazaki, Chitoshi Shimakawa, Mamoru Tanaka, Yoshinobu Kanemura, Teruyuki Nagata, Seiichi Kobayashi, Yoko Tajiri, Nobuya Kawauchi, Katsuyoshi Sasagawa
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Mar 29, 1995
Inventors
Koju Okazaki
Chitoshi Shimakawa
Mamoru Tanaka
Yoshinobu Kanemura
Teruyuki Nagata
Seiichi Kobayashi
Yoko Tajiri
Nobuya Kawauchi
Katsuyoshi Sasagawa
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.