Granted Patent
Utility
US 4,524,271 · App. 06/487,117
Laser blocking shutter
Inventor:
Donald W. Parker
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Apr 21, 1983
Inventor
Donald W. Parker
Assignee (at issue)
Cilco, 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.