Granted Patent
Utility
US 5,177,638 · App. 07/788,610
Zoom lens-barrel
Inventors:
Tetsuji Emura, Tohru Horikoshi, Kazuhiko Futagawa
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Nov 6, 1991
Inventors
Tetsuji Emura
Tohru Horikoshi
Kazuhiko Futagawa
Assignee (at issue)
Konica 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.