System and method of access control for spaces and services
US10665041B1 · kind B1 · utility
0Cited by
2References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2018 |
| Grant date | May 26, 2020 |
| Priority date | — |
| Expiry date | Nov 1, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/33
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method of controlling access to an enclosed area having a boundary includes generating a first inaudible audio signal inside the enclosed area, and generating a second signal, each configured to be sensed by a sensing device, wherein the first inaudible audio signal is not capable of penetrating the boundary; determining a state of the enclosed area, based on either the first inaudible audio signal, or the first inaudible audio signal and the second signal, being sensed by the sensing device; and based on the state, generating an instruction to perform access control for the enclosed area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.