Patent US3694699A successfully refreshed from Google Patents.
US3694699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic based substrates for electronic circuits with improved heat dissipating properties and circuits including the same
Assignee: National Beryllia Corp
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Filing: 1970-03-30
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Granted: 1972-09-26
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Expires: 1990-03-30
Abstract
Abstract At least one irregularly shaped, metal, radiating film is applied in heat conducting relation to a ceramic substrate which contains, or is adapted to contain, an electronic circuit on a non-conducting or non-coated region thereof.
Inventors
- 👤 Christopher L Snyder
- 👤 Philip S Hessinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; H10N; H10N97/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
The substrate as claimed in claim 1 wherein said irregularly shaped metal means comprises holes and edges adapted to produce turbulence in air currents passing over the same.
Claim 2
Dependent Claim
16 words
The substrate as claimed in claim 1 wherein said planar upper surface contains an electronic circuit.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |