Electronic level apparatus and method
US4932132A · kind A · utility
15Cited by
10References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Mar 1, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C9/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to an electronic level apparatus wherein a hollow torus is rotatably mounted in the level. A body of ferromagnetic fluid creates a horizontal reference and is sensed to provide an audible signal when a predetermined angular orientation is detected by the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.