Granted Patent
Utility
US 4,689,691 · App. 06/692,632
Phototelegraphic transmission apparatus
Inventors:
Masaki Isogai, Yukio Nakagawa
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: Jan 18, 1985
Inventors
Masaki Isogai
Yukio Nakagawa
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.