US3602297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer tube assembly
Assignee: GEA Group AG
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Filing: 1969-05-22
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Granted: 1971-08-31
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Expires: 1989-05-22
Abstract
Abstract A heat transfer tube assembly (heat pipe) using lithium as its working fluid is provided with 5-500 p.p.m. of an oxygenstabilizing agent in the refractory alloy of the wall material to prevent oxygen corrosion at operating conditions.
Inventors
- 👤 Gunther Kraft
- 👤 Manfred Potzschke
- 👤 Claus Busse
- 👤 Franz Geiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:54
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; C; C22; C22C; C22C27/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
40 words
A heat transfer tube assembly, which comprises a heat transfer tube consisting of a refractory alloy containing 5-500 p.p.m. of an oxygen-stabilizing agent, means sealing said tube at both ends, and a body of metallic lithium partly filling said tube.
Claim 2
Dependent Claim
40 words
A heat transfer tube assembly, which comprises a heat transfer tube consisting of a refractory alloy containing 5-500 p.p.m. of an oxygen-stabilizing agent, means sealing said tube at both ends, and a body of metallic lithium partly filling said tube.
Claim 3
Dependent Claim
29 words
A heat transfer tube assembly as set forth in claim 1, in which said oxygen-stabilizing agent is selected from the class consisting of yttrium and the rare earth elements.
Claim 4
Dependent Claim
28 words
A heat transfer tube assembly as set forth in claim 2, in which said refractory alloy is selected from the class consisting of alloys of tantalum and columbium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |