Patent US4143316A successfully refreshed from Google Patents.
US4143316A
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Hydrogen consentration meter utilizing a diffusion tube composed of 2 1/4 Cr
Assignee: United States Department of Energy
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Filing: 1977-09-07
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Granted: 1979-03-06
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Expires: 1997-09-07
Abstract
Abstract A diffusion tube hydrogen meter for improving the sensitivity and response time for the measurement of hydrogen in liquid sodium. The improved hydrogen meter has a composite membrane composed of pure nickel sleeve fitted, for example, over a 2 1/4 Cr-1 Mo steel or niobium diffusion tube. Since the hydrogen permeation rate through 2 1/4 Cr-1 Mo steels is a factor of four higher than pure nickel, and the permeation rate of hydrogen through niobium is two orders of magnitude greater than the 2 1/4 Cr-1 Mo steel, this results in a decrease in response time and an increase in the sensitivity.
Inventors
- 👤 Prodyot Roy
- 👤 David W. Sandusky
- 👤 Robert T. Hartle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:31
CPC Classifications
G; G21; G21C; G21C17/00; G21C17/02; G21C17/022; G21C17/025; G01; G01N; G01N33/00; G01N33/20; G01N33/202; G01N33/2022; G01N33/2025; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
In a hydrogen meter for measuring hydrogen concentration in liquid sodium comprising a diffusion tube assembly, ion pump means connected to create a vacuum within said diffusion tube assembly, and power supply and current readout means connected to said ion pump means; the improvement comprising said diffusion tube assembly being provided with a composite membrane consisting of a diffusion tube composed of 21/4 Cr-l Mo steel, and a sleeve of essentially pure nickel about said diffusion tube.
Claim 2
Dependent Claim
77 words
In a hydrogen meter for measuring hydrogen concentration in liquid sodium comprising a diffusion tube assembly, ion pump means connected to create a vacuum within said diffusion tube assembly, and power supply and current readout means connected to said ion pump means; the improvement comprising said diffusion tube assembly being provided with a composite membrane consisting of a diffusion tube composed of 21/4 Cr-l Mo steel, and a sleeve of essentially pure nickel about said diffusion tube.
Claim 3
Dependent Claim
31 words
The hydrogen meter defined in claim 1, wherein said diffusion tube has a wall thickness of about 10 mils, and wherein said sleeve has a wall thickness of about 4 mils.
Claim 4
Dependent Claim
31 words
The hydrogen meter defined in claim 1, wherein said diffusion tube assembly additionally includes a flange member and an end cap secured to each of said diffusion tube and said sleeve.
Claim 5
Dependent Claim
54 words
The hydrogen meter defined in claim 3, wherein said diffusion tube is secured in abutting relationship with said flange member and said end cap by weld joints, and wherein said sleeve is shrink fitted over said diffusion tube and securing in overlapping relationship with said flange member and said end cap by weld joints.
Claim 6
Dependent Claim
20 words
The hydrogen meter defined in claim 4, wherein said flange member and said end cap are constructed of stainless steel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |