Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1996-06-10
1998-11-17
Jones, Deborah
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 3115, 283 74, 347 20, 427 7, C09D 1102
Patent
active
058370420
ABSTRACT:
The present invention provides jet ink compositions suitable for producing security markings on documents and other articles for subsequent identification. The jet ink composition comprises a fluorescent colorant, an ink carrier, and optionally one or more binder resins. The markings are invisible to the unaided eye and are visible only when excited by ultraviolet light. The colorant comprises a rare earth metal and a chelating ligand, is excitable by ultraviolet light having a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 550 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane. The present invention further provides a method of identifying objects comprising providing a security marking as described above, exciting the marking and reading the fluorescent emission. The present invention also provides a system for identification of objects bearing the security markings.
REFERENCES:
patent: 4202491 (1980-05-01), Suzuki
patent: 4540595 (1985-09-01), Acitelli et al.
patent: 4736425 (1988-04-01), Jalon
patent: 4983817 (1991-01-01), Dolash et al.
patent: 5093147 (1992-03-01), Andrus et al.
PCT Search Report dated Sep. 11, 1996.
Chandrasekhar, Journal of Imaging Technology, 16, 158-161 (Aug., 1990).
Wieczoreck, Riedel de Haen, Luminescent Pigments for the Security Coding of Banknotes, Lecture in Haarlem, Netherlands, pp. 1-7 (1990).
Deng Godwin
Ezpeleta Jose F.
Lent Bruce A.
Jones Deborah
Videojet Systems International Inc.
LandOfFree
Invisible fluorescent jet ink does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Invisible fluorescent jet ink, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Invisible fluorescent jet ink will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-880196