Microwave date transmission apparatus
US5021790A · kind A · utility
13Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | May 14, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A microwave data transmission apparatus adapted to transmit and receive information by microwaves, in which an identification tag is made smaller in size and lighter in weight to considerably improve the convenience in a setting operation for use in many applications. The apparatus can be applied for production control within a factory or can be used to recognize whether a person wearing an identification tag has entered or left a room.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.