Rolling code security system
US6154544A · kind A · utility
129Cited by
158References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1997 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Jun 11, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S40/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.