Granted Patent
Utility
US 5,031,377 · App. 07/622,290
Artificial beam
Inventor:
Robert C. Beckmann
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Dec 7, 1990
Inventor
Robert C. Beckmann
Assignee (at issue)
McCalla/Lackey Products 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.