Thermosensitive label rendered unusable by removal from its first application
US4738472A · kind A · utility
10Cited by
11References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1986 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Nov 12, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2839
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thermosensitive label rendered unusable by removal from its first application includes a thermosensitive color-forming layer on one side of a substrate and a remoistenable adhesive on an opposite side of the substrate. The substrate is selected to have a tensile strength less than that necessary to separate the substrate from a surface after its first application thereto without ripping. The activation temperature of the thermosensitive color-forming layer is selected so that attempts to remove the label from its first application by means of heat, or steam, cause discoloration of the label.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.