Patent US3666967A successfully refreshed from Google Patents.
US3666967A
Expired / Lapsed
US
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Self-destruct aluminum-tungstic oxide films
Assignee: United States Department of the Navy
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Filing: 1971-05-12
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Granted: 1972-05-30
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Expires: 1991-05-12
Abstract
Abstract A multilayer thin film circuit board having thin film layers of the thermite reaction class, such as tungstic oxide and aluminum materials, coupled to a switched voltage source to be switched in circuit to cause ignition of the thermite layer and cause destruction of the film circuit.
Inventors
- 👤 Frank Z Keister
- 👤 Gary S Smolker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:28
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/0286; H05K1/0293; F; F41; F41H; F41H13/00; H10; H10N; H10N97/00; H05K1/0275; H05K2201/00; H05K2201/03; H05K2201/0302; H05K2201/0317; H05K2203/00; H05K2203/11; H05K2203/1163; H05K2203/17; H05K2203/175; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/933; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/12493; Y10T428/12736; Y10T428/12771; Y10T428/12861; Y10T428/12889; Y10T428/12944; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
38 words
A self-destruct thin film circuit as set forth in claim 1 wherein said tungstic oxide film is a thickness of about 1,500 angstroms and said aluminum is of a thickness to provide a resistance of about 0.5 ohms.
Claim 2
Dependent Claim
35 words
A self-destruct thin film circuit as set forth in claim 1 wherein said film deposit of said tungstic oxide to aluminum on a volumetric basis is from 1 to 1 to 1 1/2 to 1.
Claim 3
Dependent Claim
31 words
A self-destruct thin film circuit as set forth in claim 1 wherein said tungstic oxide and aluminum thin films are deposited on a weight-to-weight basis of about 4 1/2 to 1.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |