Method and apparatus for the prevention of unauthorized copying of documents
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 7, 1987
Grant Date -
N/A
app pub date -
May 30, 1986
filing date -
May 30, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and apparatus are disclosed for the prevention of unauthorized copying of documentation on an office, or other type, copier. Unique phosphors are applied to paper. When such a paper is placed on or in a copier so prepared, the presence of the phosphor is detected and the copier is disabled. Inside the copier a laser emits a beam toward the paper. Two detectors detect, respectively, the laser light reflected from the document and the stimulated light from the phosphor coating or layer. Detection of both signals, in the proper time sequence, will cause the photocopier to cease operation prior to electrostatic or other capture of the image. Upconversion phosphors could be utilized as the phosphor coating due to their scarcity and unliklihood of use in this manner.
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