Dynamic security device
US11675183B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 16, 2020 |
| Grant date | Jun 13, 2023 |
| Priority date | — |
| Expiry date | Oct 1, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/38
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A security device that exhibits at least one dynamic response upon change of orientation of the security device with respect to gravity, wherein the security device includes a hollow capsule completely filled with a liquid and one or more microscopic elements. In addition, the dynamic response continues after cessation of the change of orientation with respect to gravity. The dynamic response includes a transition of the one or more microscopic elements from substantial mechanical equilibrium to non-equilibrium upon action of the change of orientation with respect to gravity and back to substantial mechanical equilibrium after cessation of the change of orientation with respect to gravity. During the dynamic response, the one or more microscopic elements undergo at least one of a rotational motion and a translational motion relative to the liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.