Granted Patent
Utility
US 4,934,812 · App. 07/017,616
Light detector
Inventors:
Satoshi Hirano, Yoshio Horikawa
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Feb 24, 1987
Inventors
Satoshi Hirano
Yoshio Horikawa
Assignee (at issue)
Tokyo Kogaku Kikai Kabushiki Kaisha
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.