Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1985-02-26
1987-12-01
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, G01J 100
Patent
active
047106271
ABSTRACT:
A security blank includes a sheet, and an elongated security thread connected to the sheet. The security thread may be identified upon being irradiated by electromagnetic radiation by a recognizable signature from radiation scattered therefrom; the cross-section of the security thread is other than circular or rectangular and is substantially constant over a prearranged portion of the length thereof.
REFERENCES:
patent: 4186943 (1980-02-01), Lee
patent: 4290630 (1981-09-01), Lee
patent: 4306151 (1981-12-01), Chase
patent: 4371196 (1983-02-01), von Kompski et al.
patent: 4524276 (1985-06-01), Ohtombe
Baltes Heinrich P.
Huiser Andre M. J.
Howell Janice A.
LGZ Landis & Gyr Zug AG
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