US4031921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen-isotope permeation barrier
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-09-09
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Granted: 1977-06-28
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Expires: 1995-09-09
Abstract
Abstract A composite including a plurality of metal layers has a Cu-Al-Fe bronze layer and at least one outer layer of a heat and corrosion resistant metal alloy. The bronze layer is ordinarily intermediate two outer layers of metal such as austenitic stainless steel, nickel alloys or alloys of the refractory metals. The composite provides a barrier to hydrogen isotopes, particularly tritium that can reduce permeation by at least about 30 fold and possibly more below permeation through equal thicknesses of the outer layer material.
Inventors
- 👤 Victor A. Maroni
- 👤 Erven H. Van Deventer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:50
CPC Classifications
G; G21; G21B; G21B1/00; G21B1/11; G21B1/13; B; B32; B32B; B32B15/00; B32B15/01; B32B15/013; G21F; G21F1/00; G21F1/02; G21F1/08; G21F5/00; G21F5/005; Y; Y02; Y02E; Y02E30/00; Y02E30/10; Y10; Y10S; Y10S376/00; Y10S376/90; Y10T; Y10T428/00; Y10T428/12; Y10T428/12292
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A composite tube for use as a hydrogen barrier in a system in which at least one surface contacts a molten salt of lithium containing tritium and an opposite surface contacts a liquid metal stream, said tube comprising an inner tubular layer of austenitic stainless steel, an intermediate, tubular layer of a bronze comprising about 10 weight % Al, 4 weight % Fe and the balance essentially Cu and a outer tubular layer of a refractory metal alloy selected from the group consisting of molybdenum base alloys, niobium base alloys and vanadium base alloys, said outer tubular layer being adapted for contacting said molten salt of lithium metal.
Claim 2
Dependent Claim
108 words
A composite tube for use as a hydrogen barrier in a system in which at least one surface contacts a molten salt of lithium containing tritium and an opposite surface contacts a liquid metal stream, said tube comprising an inner tubular layer of austenitic stainless steel, an intermediate, tubular layer of a bronze comprising about 10 weight % Al, 4 weight % Fe and the balance essentially Cu and a outer tubular layer of a refractory metal alloy selected from the group consisting of molybdenum base alloys, niobium base alloys and vanadium base alloys, said outer tubular layer being adapted for contacting said molten salt of lithium metal.
Claim 3
Dependent Claim
16 words
The composite tube of claim 1 wherein said outer tubular layer comprises a niobium base alloy.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |