Granted Patent
Utility
US 5,677,797 · App. 08/192,328
Method for correcting field curvature
Inventor:
Ellis I. Betensky
Patented Case
View Patent ↗
Granted: Oct 14, 1997
Filed: Feb 4, 1994
Inventor
Ellis I. Betensky
Assignee (at issue)
U.S. Precision Lens Incorporated
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.