US3893148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Layered superlattic switching and negative resistance devices
Assignee: United States Department of the Navy
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Filing: 1974-02-25
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Granted: 1975-07-01
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Expires: 1994-02-25
Abstract
Abstract A solid state switching device is described that is capable of existing in a multiplicity of successive resistance states. The described device comprises layered superlattice structures generated, for example, by successive deposition of alternated layers of silicon monoxide and silver onto a substrate by evaporation.
Inventors
- 👤 A Hamid Madjid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:09
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/56; H; H10; H10N; H10N70/00; H10N70/011; H10N70/021; H10N70/026; H10N70/20; H10N70/801; H10N70/821; H10N70/826; H10N70/881; Y; Y10; Y10S; Y10S148/00; Y10S148/067; Y10S148/072; Y10S148/169
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A SOLID STATE, MULTIPLE RESISTANCE SWITCHING DEVICE COMPRISING: SUBSTRATE MEANS, INCLUDING A FIRST CONDUCTIVE LAYER, FOR SUPPORTING THIN FILM LAYERS AND FOR PROVIDING ELECTRICAL CONNECTION WITH A FIRST ONE OF SAID THIN FILM LAYERS, A PLURALITY OF SUPERIMPOSED THIN FILM LAYERS SUPPORTED ON SAID SUBSTRATE MEANS AND COMPRISING ALTERNATE SILICON MONOXIDE AND SILVER THIN FILM LAYERS, ADJACENT ONES OF SAID SILICON MONIXIDE AND OF SAID SILVER THIN FILM LAYERS FORMING LAYER PAIRS, SAID SILICON MONIXIDE THIN FILM LAYERS EACH BEING IN THE RANGE OF 20 A TO 90 A IN THICKNESS AND SAID SILVER THIN FILM LAYERS EACH BEING IN THE RANGE OF 3 A TO 85 A IN THICKNESS,
Claim 2
Dependent Claim
110 words
A SOLID STATE, MULTIPLE RESISTANCE SWITCHING DEVICE COMPRISING: SUBSTRATE MEANS, INCLUDING A FIRST CONDUCTIVE LAYER, FOR SUPPORTING THIN FILM LAYERS AND FOR PROVIDING ELECTRICAL CONNECTION WITH A FIRST ONE OF SAID THIN FILM LAYERS, A PLURALITY OF SUPERIMPOSED THIN FILM LAYERS SUPPORTED ON SAID SUBSTRATE MEANS AND COMPRISING ALTERNATE SILICON MONOXIDE AND SILVER THIN FILM LAYERS, ADJACENT ONES OF SAID SILICON MONIXIDE AND OF SAID SILVER THIN FILM LAYERS FORMING LAYER PAIRS, SAID SILICON MONIXIDE THIN FILM LAYERS EACH BEING IN THE RANGE OF 20 A TO 90 A IN THICKNESS AND SAID SILVER THIN FILM LAYERS EACH BEING IN THE RANGE OF 3 A TO 85 A IN THICKNESS,
Claim 3
Dependent Claim
27 words
A solid state, multiple resistance switching device as defined in claim 1, and wherein: said layer pairs are in the range of 60 to 360 in number.
Claim 4
Dependent Claim
29 words
A solid state, multiple resistance switching device as defined in claim 2, and wherein: said superlattice structures Have identity periods in the range of 25 A to 170 A.
Claim 5
Dependent Claim
30 words
A solid state, multiple resistance switching device as defined in claim 3, and wherein: said substrate means comprises a supportive layer of glass, and said first conductive layer comprises gold.
Claim 6
Dependent Claim
32 words
A solid state, multiple resistance switching device as defined in claim 3, and wherein: said second conductive layer comprises a layer of silver, applied as a dispersion of silver in a vehicle.
Claim 7
Dependent Claim
36 words
A solid state, multiple resistance switching device as defined in claim 3, and: said device being further characterized by being reversible in its ability to change between said discrete resistance values in response to changing voltages.
Claim 8
Dependent Claim
34 words
A solid state, multiple resistance switching device as defined in claim 6, and wherein: said substrate means comprises a supportive layer of substantially non-conductive material; and said first conductive layer comprises a metal film.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |