Granted Patent
Utility
US 5,225,928 · App. 07/772,068
Focus compensating lens for use in extreme temperatures
Inventor:
John P. Dugan
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Oct 7, 1991
Inventor
John P. Dugan
Assignee (at issue)
Spectra-Physics Laserplane, 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.