Alert system, delivery system and method and door bell system
US10757235B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2016 |
| Grant date | Aug 25, 2020 |
| Priority date | — |
| Expiry date | Jul 22, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B19/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Alert device comprising electronic circuitry and at least a first antenna, wherein the circuitry is designed for sending out a first signal, for wireless communication with at least a first hand held communication device, and at least a second signal for wireless communication with at least a second hand held communication device, wherein the second signal differs from the first signal, preferably in at least one of transmitting energy, transmitting frequency, coding and pulse length, wherein the device comprises a switch for switching between: —a first mode in which only the first signal is transmitted and a second mode wherein the first and second signal are transmitted; or —a first mode wherein only the first signal is transmitted and a second mode wherein only the second signal is transmitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.