Holographic stop sign
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Mar 21, 1997
filing date -
Mar 21, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A warning indicator that comprises a lamp hidden adjacent to the roof of a vehicle, such as a school bus, and a transmission hologram decal containing a hologram that is mounted on a front or rear window of the vehicle. The lamp projects a beam of light downward onto the transmission hologram decal where it is diffracted by the hologram into a predetermined angular field of view at the front of rear of the vehicle. The hologram projects an image, such as the word 'STOP', for example, to warn drivers of other vehicles that the vehicle, such as the school bus, for example, has come to a stop. The hologram is preferentially designed to have an asymmetrically-shaped field of view.
First Claim
Other Claims data not available