ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,452, issued on May 27, was assigned to FFE Ltd. (Great Britain).
"Beam detectors" was invented by Oliver Burstall (Hitchin, Great Britain) and Steve Revill (Hitchin, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A beam detector apparatus (1) comprising: beam emitter apparatus (2); reflector apparatus (3), locatable across a volume to be monitored; and beam receiver apparatus (4). The beam emitter apparatus (2) is capable of creating a first linearly polarised beam of light of first linear polarisation and directing said first linearly polarised beam of light towards the reflector apparatus. The reflector apparatus (3) is capable of ei...