Sight glass
US6578418B2 · kind B2 · utility
4Cited by
25References
25Claims
0Family size
Inventor
Key dates
| Filing date | Nov 23, 1998 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Nov 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/2922
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sight glass apparatus has a liquid level indicator for identifying the level of a clear to slightly translucent liquid in tube by a change in color of the indicator. The indicator has a transparent body with a convex lens, and a concave lens at opposite ends of the body, and V-grooves open to opposite sides of the body. A moisture indicating medium on the body functions to identify the presence of water in refrigeration and air-conditioning systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.