Rolling code security system
US6690796B1 · kind B1 · utility
68Cited by
162References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2000 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Jan 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/84
- WIPO fieldControl
- WIPO sectorInstruments
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.