| US 7,455,724 B2 | ||
| Decoder system | ||
| Wing Sum Vincent Kwan, Chicago, Ill. (US); and Leighton Davies-Smith, Oak Ridge, N.C. (US) | ||
| Assigned to Sanford, L.P., Oak Brook, Ill. (US) | ||
| Filed on Aug. 18, 2005, as Appl. No. 11/207,845. | ||
| Claims priority of provisional application 60/602785, filed on Aug. 19, 2004. | ||
| Prior Publication US 2007/0240607 A1, Oct. 18, 2007 | ||
| Int. Cl. C09D 11/00 (2006.01) | ||
| U.S. Cl. 106—31.32 | 18 Claims |
| 1. A decoder system, comprising:
a coding composition comprising a solvent system including a first solvent and either a volatile acid or a volatile base,
a color change dye capable of becoming substantially colorless upon evaporation of the solvent system, and a first color-destroying
agent;
a decoding composition comprising a second solvent and an eradicable dye capable of becoming substantially colorless when
contacted with the color-destroying agent; and,
an erasing composition comprising a third solvent and a second color-destroying agent.
|