Liquid level gauge illuminating system
US4217778A · kind A · utility
1Cited by
9References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1978 |
| Grant date | Aug 19, 1980 |
| Priority date | — |
| Expiry date | Oct 23, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A Blackburn-type liquid level gauge which is observed by a TV camera has its frontal display structure illuminated in an area where light is not being transmitted through the gauge by light which is refracted away from the TV camera and reflected back onto the face of the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.