Method for detecting the absence of a physical element in a geographical zone, and associated system
US12412458B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2022 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Jun 26, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method for transmitting a message by ambient scattering. The method is implemented by a transmitting device in response to the transmitting device changing from a first state in which the transmitting device is deprived from illumination to a second state in which the transmitting device is illuminated by at least one light source. The method includes: obtaining an amount of electrical energy stored from light energy; comparing the amount of electrical energy stored with a given threshold, the threshold representing an electrical energy quantity sufficient to allow transmission of a message by ambient scattering; and in response to the threshold being overrun, transmitting a message called “information message”, representative of the threshold overrun, the transmission being implemented by using the stored electrical energy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.