Granted Patent
Utility
US 5,257,279 · App. 07/893,260
Adjustable focus technique and apparatus using a moveable weak lens
Inventors:
John P. Dugan, James N. Hayes, Steve Elliott
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Jun 4, 1992
Inventors
John P. Dugan
James N. Hayes
Steve Elliott
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.