Granted Patent
Utility
US 6,166,125 · App. 09/164,371
Graded-refractive-index optical plastic material and method for its production
Inventors:
Norihide Sugiyama, Hidenobu Murofushi, Takashi Okazoe, Masayuki Tamura, Shin Tatematsu, Jun Irisawa
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Oct 1, 1998
Inventors
Norihide Sugiyama
Hidenobu Murofushi
Takashi Okazoe
Masayuki Tamura
Shin Tatematsu
Jun Irisawa
Assignee (at issue)
ASAHI GLASS CO., LTD.
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.