Granted Patent
Utility
US 4,812,423 · App. 06/758,645
Optical light weight glass
Inventors:
Hiroyuki Kodama, Katsumi Mangyo, Takeo Ichimura
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Jul 17, 1985
Inventors
Hiroyuki Kodama
Katsumi Mangyo
Takeo Ichimura
Assignee (at issue)
NIKON CORPORATION
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.