Granted Patent
Utility
US 5,194,559 · App. 07/854,583
Optical urethane resins and plastic lenses comprising the same
Inventors:
Koju Okazaki, Masahiko Kusumoto, Hiroyuki Yamashita, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Mar 16, 1993
Filed: Mar 20, 1992
Inventors
Koju Okazaki
Masahiko Kusumoto
Hiroyuki Yamashita
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.