Patent US4513352A successfully refreshed from Google Patents.
US4513352A
Expired / Lapsed
US
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Thermal protection apparatus
Assignee: United States Department of Energy
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Filing: 1984-03-20
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Granted: 1985-04-23
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Expires: 2004-03-20
Abstract
Abstract An apparatus which thermally protects sensitive components in tools used in a geothermal borehole. The apparatus comprises a Dewar within a housing. The Dewar contains heat pipes such as brass heat pipes for thermally conducting heat from heat sensitive components to a heat sink such as ice.
Inventors
- 👤 Gloria A. Bennett
- 👤 Michael G. Elder
- 👤 Joseph E. Kemme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:17
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/2029; H05K7/20336; Y; Y10; Y10S; Y10S165/00; Y10S165/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
Apparatus which thermally protects heat-sensitive components in tools used in geothermal boreholes, said apparatus comprising: a. a housing; b. a Dewar disposed within said housing; c. thermally conductive bulkheads disposed within said Dewar and on either side of and thermally communicating with the heat-sensitive components; d. a heat sink of suitable temperature disposed within said Dewar; and e. a heat pipe conducting heat from the components through said bulkheads and to said heat sink.
Claim 2
Dependent Claim
74 words
Apparatus which thermally protects heat-sensitive components in tools used in geothermal boreholes, said apparatus comprising: a. a housing; b. a Dewar disposed within said housing; c. thermally conductive bulkheads disposed within said Dewar and on either side of and thermally communicating with the heat-sensitive components; d. a heat sink of suitable temperature disposed within said Dewar; and e. a heat pipe conducting heat from the components through said bulkheads and to said heat sink.
Claim 3
Dependent Claim
11 words
The invention of claim 1 wherein said heat sink comprises ice.
Claim 4
Dependent Claim
15 words
The invention of claim 1 wherein said heat sink is located above the heat-sensitive components.
Claim 5
Dependent Claim
18 words
The invention of claim 1 wherein said heat pipe comprises a state-changing fluid within a hollow brass tube.
Claim 6
Dependent Claim
11 words
The invention of claim 4 wherein said state-changing fluid comprises methanol.
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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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |