US3616533A
Expired / Lapsed
US
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Method of protecting articles in high temperature environment
Assignee: Boeing North American Inc
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Filing: 1969-10-28
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Granted: 1971-11-02
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Expires: 1989-10-28
Abstract
Abstract ELECTRICAL COMPONENTS MOUNTED ON A PRINTED CIRCUIT BOARD ARE PROTECTED FROM HEAT BY COVERING THE COMPONENTS WITH A VISCOUS COOLANT IN A CONTAINER CONFORMING TO THE CONFIRUGATION OF EACH OF THE COMPONENTS THE COOLANT COMPRISES A VISCOUS LIQUID SUSPENSION OF POWERED MATERIAL IN WATER. THE LIQUID SUSPENSION POVIDES A HEAT SINK AND IS COHESIVE TO RETAIN A MINIMUM SURFACE AREA UPON ACCIDENTAL SPILLAGE TO MOLTEN SOLDER OR LIKE HEATES SURFACE AREA WHEREBY "FLASH" VAPORIZATION IS AVOIDED.
Inventors
- 👤 Richard T Heap
- 👤 Joseph C Widmont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:59
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/20218; H05K7/20236; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K2203/00; H05K2203/01; H05K2203/0191; H05K2203/07; H05K2203/0756; H05K2203/0776; H05K2203/11; H05K2203/1121; H05K3/3447; H05K3/3465; H05K3/3468; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/4913; Y10T29/49139; Y10T29/49144
Claims Analysis
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |