Multi-detectable ink compositions and method of use

• US 3,928,226 A
• Filed: 01/16/1974
• Issued: 12/23/1975
• Est. Priority Date: 01/16/1974
• Status: Expired due to Term

• Current Assignee: James A. Montlick, Richard A. Bernard, William F. Mcdonough
• Original Assignee: James A. Montlick, Richard A. Bernard, William F. Mcdonough
• Inventors: Bernard, Richard A., McDonough, William F., Montlick, James A.
• Primary Examiner(s): Demers, Arthur P.
• Application Number:
  US05/433,806
• Time in Patent Office: 706 Days
• Field of Search: 252/31.2R,31.3R 106/21
• US Class Current: 252/301.35
• CPC Class Codes: C09D 11/50 Sympathetic, colour changing or similar inks
• CPC Class Codes: C09D 5/22 Luminous paints luminescent compositions C09K11/00
• CPC Class Codes: Y10S 428/916 Fraud or tamper detecting

Abstract

Inks are disclosed wherein the ordinary mixed light color of the ink is a color substantially different than the fluorescent color of the ink. Methods of use include detection of at least the fluorescent wavelength of the ink or detection of both the ink colors when irradiated for fluorescence and by exposure to mixed light.

Claims

1. A MACHINE-READABLE MARKING INK COMPOSITION HAVING TWO OR MORE MIXIED PIGMENTS FOR PROCESSING AND DISTINGUISHING ARTICLES BOTH BISUALLY AND UNDER RADIATION OF A DISCRETE PREDETERMINED WAVELENGTH, COMPRISING A. FROM 0.5 TO 10 PERCENT NON-FLUORESECENT PIGMENT BY WEIGHT;

B. FROM 2.0 TO 25.0 PERCENT FLUORESCENT PIGMENT BY WEIGHT WHICH FLUORESCES UNDER RADIATION AT A PREDETERMINED WAVELENGTH,

2. The machine-readable marking ink of claim 1 wherein the fluorescent wavelength of said fluorescent pigment is from 5800 A to 6200 A.

3. The machine-readable marking ink of claim 1 wherein said surfactant is lecithin and said gellant is aluminum stearate.

4. The machine-readable marking ink composition defined in claim 1 wherein said vehicle consists substantially of a mixture of said dioctyl phthalate and said aliphatic hydrocarbon in a ratio of about 3:

1. .