Liquid level indication device
US4845986A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1986 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Aug 8, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid level indicator for detecting a liquid level by utilizing the variation inductance of a coil having a core made of an electrical insulating magnetic material and provided inside a winding of the coil. The core may be made by piling a plurality of thin, plate-shaped conductive materials one on another in the cross-sectional direction of the coil so that they are insulated from each other or by winding a conductive magnetic material at least one turn in the form of a roll so that a closed loop current is not formed in the cross-sectional direction of the coil. An eddy current loss of the core so arranged is so small that it can be disregarded. Furthermore, the winding component of the core itself is substantially released in the equivalent circuit of the coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.