Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1987-03-27
1988-04-19
Swisher, Nancy A. B.
Stock material or miscellaneous articles
Composite
Of inorganic material
4285375, B32B 1304
Patent
active
047389010
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.
REFERENCES:
patent: 2822288 (1958-02-01), Harvey et al.
patent: 4442170 (1984-04-01), Kaule et al.
patent: 4451521 (1984-05-01), Kaule et al.
patent: 4451530 (1984-05-01), Kaule et al.
patent: 4452843 (1984-06-01), Kaule et al.
patent: 4627642 (1986-12-01), Peronneau et al.
patent: 4627997 (1986-12-01), Ide
Finkel Joel R.
Green William D.
Gustafson Kenneth I.
Jacobs Paul F.
Swisher Nancy A. B.
Weiss Franklyn C.
Xerox Corporation
LandOfFree
Method and apparatus for the prevention of unauthorized copying does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for the prevention of unauthorized copying , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for the prevention of unauthorized copying will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2174839