Granted Patent
Utility
US 6,239,920 · App. 09/521,388
Zoom lens system
Inventors:
Hiroyuki Matsumoto, Osamu Okubo, Akio Miyata
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Mar 8, 2000
Inventors
Hiroyuki Matsumoto
Osamu Okubo
Akio Miyata
Assignee (at issue)
Minolta Co., Ltd.
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.