Capacitive liquid level sensor
US4977786A · kind A · utility
71Cited by
10References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 18, 1990 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Jan 18, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2035/1025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitance liquid level sensor uses an oscillator and sweeps the oscillator frequency at an ultrasonic rate thereby spreading the frequency spectrum and reducing interference from external radio transmitters and interference to local radio receivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.