Granted Patent
Utility
US 4,911,538 · App. 07/381,421
Lens system comprising plastic and liquid lens elements with aspherical surfaces
Inventor:
Paul N. Robb
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Jul 18, 1989
Inventor
Paul N. Robb
Assignee (at issue)
Lockheed Missiles & Space Company, 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.