Granted Patent
Utility
US 5,953,440 · App. 08/982,364
Method of measuring the focus of close-up images of eyes
Inventors:
Guang Hua Zhang, Marcos Salganicoff
Patented Case
View Patent ↗
Granted: Sep 14, 1999
Filed: Dec 2, 1997
Inventors
Guang Hua Zhang
Marcos Salganicoff
Assignee (at issue)
Sensar, Inc.
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.