Granted Patent
Utility
US 4,972,429 · App. 07/273,228
Achromatic prism beam expander for high magnification and tunable laser using same
Inventor:
Richard L. Herbst
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Nov 18, 1988
Inventor
Richard L. Herbst
Assignee (at issue)
Spectra-Physics, 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.