Level gauge for liquid helium
US4944183A · kind A · utility
5Cited by
6References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 29, 1988 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Nov 29, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/847
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A level gauge and measurement method are provided using a sensing element comprising a superconductive alloy represented by the formula: EQU Mo.sub.a Ru.sub.b Z.sub.c wherein Z is phosphorous, boron, or a mixture of phosphorous and boron, PA1 b has a value of about 20 to about 40, PA1 c has a value of about 10 to about 30, and PA1 a+b+c=100. The sensing element has a superconductivity critical temperature of at least 4.2K and is useful for measuring the level of liquid helium independently of pressure fluctuations in the reservoir vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.