Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-05-01
2007-05-01
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S227150, C250S474100, C340S545600, C340S550000, C385S012000
Reexamination Certificate
active
10981836
ABSTRACT:
A sheet includes an optical fiber extending across at least a portion of its surface to detect nuclear radiation. The sheet can line at least a portion of a shipping container or box. Radiation within or outside the container or box reduces optical transmissibility of the fiber. The fiber integrates the radiation over time and/or over the length of the fiber, making the fiber sensitive to even low-level radiation. Dopants, use of particular wavelengths of light or temperatures or other mechanisms can increase the sensitivity of the optical fiber to radiation. The optical fiber is monitored for a change in its transmissibility. A reduction in the transmissibility, such as to below a threshold, can trigger an alarm, such as an annunciator, or send a message that includes information about the time or the container's contents or location when the radiation is detected to a central location, such as a ship's control room or port notification system.
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Ellis Suezu
Luu Thanh X.
Tamperproof Container Licensing Corp.
Weingarten Schurgin, Gagnebin & Lebovici LLP
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