Tamper-indicating sheet
US4488646A · kind A · utility
57Cited by
15References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1983 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Oct 3, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1307
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A novel lottery ticket comprising a blush-type coating which coating is characterized by susceptibility to a change in appearance when exposed to either (a) any of a wide spectrum of organic solvents or (b) an elevated temperature. Such susceptibility reveals that solvent or thermal techniques have been used in tampering with the ticket or a pouch package in which the ticket is held. Such tampering is often the result of an illicit attempt to obtain information about the indicia printed on the ticket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.