Miniaturized data communication and identification system
US5182543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1990 |
| Grant date | Jan 26, 1993 |
| Priority date | — |
| Expiry date | Sep 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C23/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A miniaturized communications unit for use in object tracking, control and the like. Each communications and identification unit repeatedly transmits an identification code on a predetermined wavelength at a transmission interval randomly selected from within a predetermined time interval range in order to avoid repeated transmission collisions between two or more units. The transmission may further include data corresponding to a sensed environmental attribute. Each unit that receives a transmission stores the received identification code and any data in a time ordered record. This stored record preferably also includes an electronic date and time stamp. The stored data can be transmitted to an external data port for later use or analysis by an external data processor. The preferred construction of these communications and identification units includes a programmed microprocessor circuit with the program preferably stored in an electrically programmable read only memory for the sake of flexibility and ease of alternation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.