Spectrally-limited bar-code label and identification card
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 16, 1982
Grant Date -
N/A
app pub date -
Oct 28, 1980
filing date -
Oct 28, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A label or identification card has a base with a region which absorbs invisible light and a region which reflects invisible light. Both regions absorb visible light over a predetermined spectral range. A filter is disposed on the base. The filter transmits both invisible light and visible light over the said spectral range, while absorbing visible light over the spectral range outside the said range absorbed by the two regions of the base. Accordingly, the unaided human eye cannot perceive the information represented by the array of the regions on the base, while this array can be detected by scanning with invisible light. In one embodiment, the bar code is a return-to-zero double frequency code.
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