초록 ▼

Sheets used to indicate when tampering has occurred are described. Such sheets are composed of envelopes with generally thin cross sections containing compressed resilient cores which expand upon envelope breach. Expansion of the resilient core results in an obvious visual change to all or some of t

Sheets used to indicate when tampering has occurred are described. Such sheets are composed of envelopes with generally thin cross sections containing compressed resilient cores which expand upon envelope breach. Expansion of the resilient core results in an obvious visual change to all or some of the envelope surfaces. Such envelopes may also contain a translucent liquid which greatly aids in amplifying the visual changes such envelopes may exhibit. Embodiments may take the form of applied labels, adhesive tape, wrapping paper, mail envelopes, bottle caps, document enclosures, blister packs, etc. Applications include not only signaling tampering but decorative and other applications as well. Processes for fabrication of embodiments are also described.

대표청구항 ▼

[ What is claimed is:] [1.] A sheet which changes appearance in response to an input, said sheet comprising:a) an air-tight envelope with a generally thin cross section,b) said envelope including a front surface and a rear surface,c) said front surface being able to transmit light,d) a resilient cor

[ What is claimed is:] [1.] A sheet which changes appearance in response to an input, said sheet comprising:a) an air-tight envelope with a generally thin cross section,b) said envelope including a front surface and a rear surface,c) said front surface being able to transmit light,d) a resilient core enclosed within said envelope,e) said resilient core held in a compressed state by the air-tightness of said envelope until air enters said envelope through a breach in said envelope allowing air to enter said envelope and said resilient core to expand; andf) in combination, said front surface and said resilient core transmitting light noticeably different when said resilient core is compressed than when it is not compressed, reby the appearance of the sheet is changed when light passing through the combination of said front surface and said resilient core is noticeably different when the resilient core is compressed than when air enters said envelope and said resilient core thereby becomes uncompressed.