Liquid nitrogen level controller
US4135548A · kind A · utility
19Cited by
6References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1977 |
| Grant date | Jan 23, 1979 |
| Priority date | — |
| Expiry date | Aug 11, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7306
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The liquid nitrogen level in a flask is controlled by the degree of immersion of two sensing coils of copper wire in the liquid nitrogen activating a solid state switching circuit which controls a liquid nitrogen inlet flow valve. Manual override and sensor fault indication is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.