Granted Patent
Utility
US 5,617,252 · App. 08/513,250
Gradient refractive index lens elements
Inventors:
Paul K. Manhart, Tilman W. Stuhlinger, Kenneth R. Castle, Mitchell C. Ruda
Patented Case
View Patent ↗
Granted: Apr 1, 1997
Filed: Aug 10, 1995
Inventors
Paul K. Manhart
Tilman W. Stuhlinger
Kenneth R. Castle
Mitchell C. Ruda
Assignee (at issue)
LightPath Technologies, 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.