Electronic license plate for motor vehicles
US4001822A · kind A · utility
80Cited by
4References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 28, 1974 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | May 28, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic license tag or plate formed into a unitary structure and including a single antenna system cooperating in a system comprising a harmonic radiator which transmits a pulse coded identification signal in response to an interrogation signal, and in a signal communication path for detecting and decoding code modulations in the interrogation signal and deriving therefrom an information signal which is communicated to the operator of a vehicle to which the tag or plate is affixed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.