Granted Patent
Utility
US 5,539,446 · App. 08/201,256
Light beam position detection and control apparatus employing diffraction patterns
Inventor:
Paul F. Sullivan
Patented Case
View Patent ↗
Granted: Jul 23, 1996
Filed: Feb 24, 1994
Inventor
Paul F. Sullivan
Assignee (at issue)
Polaroid Corporation
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.