Copy security system

Details Copy security system Copy security system

1979-10-24

1981-12-01

Punter, William H.

Printed matter

Maps

283 8R, 283 8A, 356256, 428916, G02B 2700, B42D 1500

Patent

active

043033075

ABSTRACT:
A security system to prevent the unauthorized duplication of documents on standard electrostatic copiers. Paper substrates are coated with layers of carefully sized and spaced beads which break up the light emitted by a copier to a degree sufficient to preclude copying. In another embodiment, an original consisting of a paper substrate bonded to a reflective metalized film reflects light from the copier, and masks the image of any intelligence present on the substrate.

REFERENCES:
patent: 3154872 (1964-11-01), Nordgren
patent: 3887742 (1975-06-01), Reinnagel
patent: 4082426 (1978-04-01), Brown
Dobrowolski et al., "Optical Interference Coatings for Inhibiting of Counterfeiting", Optical Acta, 12-1973, pp. 925-937.
Born et al., "Principles of Optics", Pergamon Press, 1975, pp. 652-664

Affiliated with

Also associated with

Rating

Copy security system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Copy security system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Copy security system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1294123