Granted Patent
Utility
US 4,427,784 · App. 06/280,468
Fluophosphate optical glass
Inventors:
Hiroshi Nakamura, Takeo Ichimura
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Jul 6, 1981
Inventors
Hiroshi Nakamura
Takeo Ichimura
Assignee (at issue)
Nippon Kogaku K.K.
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.