Granted Patent
Utility
US 6,111,647 · App. 09/294,375
Detection of focal point of objective lens by means of a two-split sensor
Inventors:
Yukio Ogura, Katsunori Nagamatsu, Shingo Murakami
Patented Case
View Patent ↗
Granted: Aug 29, 2000
Filed: Apr 20, 1999
Inventors
Yukio Ogura
Katsunori Nagamatsu
Shingo Murakami
Assignee (at issue)
NEC 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.