Wireless transmitter and doorbell system
US6775523B2 · kind B2 · utility
10Cited by
10References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 3, 2002 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | Feb 7, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/42
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A wireless doorbell system which employs a radio frequency (“RF”) transmitter and a RF receiver. The doorbell transmitter has its RF source and antenna enclosed within a metal case which is designed so that the effective operating range of the transmission of the RF signals is not reduced to unacceptable levels and whose finish, such as polished brass, presents an attractive appearance which can be made to match the decorative trim at the entranceway to a building, such as a residence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.