Granted Patent
Utility
US 4,889,417 · App. 06/833,342
Projection lens for television projector
Inventor:
Norikazu Arai
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Feb 25, 1986
Inventor
Norikazu Arai
Assignee (at issue)
Konishiroku Photo Industry 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.