Identification matter

Details Identification matter Identification matter

1980-07-14

1985-02-19

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

235491, 283904, 283 75, 283109, 283 94, 428916, 428913, 430 10, B42D 1500

Patent

active

045001162

ABSTRACT:
A credential, such as a passport or an identification card, is provided, for example by impregnation or coating, with a phosphorescent composition which includes at least two phosphorescence activators which exhibit different emission characteristics both with respect to wavelength and lifetime so that, when the composition is irradiated, the initial afterglow changes color, for example from green to blue.

REFERENCES:
patent: 3279826 (1966-10-01), Rudershausen
patent: 3533176 (1970-10-01), Weitzburg
patent: 3610120 (1971-10-01), Morse et al.
patent: 3679448 (1972-07-01), Tramposch
patent: 3754959 (1973-08-01), Peters
patent: 3763356 (1973-10-01), Berler
patent: 3800142 (1974-03-01), Harshaw
patent: 3928226 (1975-12-01), McDonough
patent: 4151667 (1979-05-01), Idelson
Great Britian, No. 1123274, Virginia Laminating Company.

Affiliated with

Also associated with

Rating

Identification matter does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-609377