Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2004-11-24
2008-11-25
Porta, David P. (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
C250S340000
Reexamination Certificate
active
07456404
ABSTRACT:
A light control system and method for a film viewer (10). The viewer (10) includes an infrared emitter (50) with an infrared detector (52) in communication with a microprocessor (34). When a radiograph (40) is inserted within the film viewer (10), the radiograph (10) is interposed between the emitter (50) and detector (52). The microprocessor (34) detects a change in the emissions sensed by the detector (52) and illuminates the viewer (10). The invention also provides a film holder (16) that includes a plurality of rollers (60) interposed between the holder (16) and the screen (14).
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Borowski James D.
Masters John
Olejniczak James Todd
Pecore Rick
Steward, Jr. Curtis L.
DENTSPLY International Inc.
Gaworecki Mark R
Hura Douglas J.
Porta David P.
Sullivan Daniel W.
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