US4430255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-ohmic device using TiO2
Assignee: AT&T Inc
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Filing: 1982-09-01
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Granted: 1984-02-07
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Expires: 2002-09-01
Abstract
Abstract An electrical device having a nonlinear current-voltage characteristic is described which uses TiO 2 , a Group IIA element such as barium, calcium and strontium in an amount greater than 0.0 and generally less than approximately 1.0 mole percent, a Group VB element such as niobium in an amount generally less than 5.0 mole percent.
Inventors
- 👤 Man F. Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:58
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/115; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1272
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
120 words
A device comprising a layer, said layer comprising TiO 2 and at least two additives; and two electrical contacts to said layer; characterized in that a first said additive is at least one element selected from the group consisting of elements of Group IIA of the Periodic Table, said first additive being present in an amount greater than 0.0 mole percent and less than 1.0 mole percent and a second said additive is at least one element selected from the group consisting of elements of Group VB of the Periodic Table, said second additive being present in an amount greater than 0.0 mole percent and less than 5.0 mole percent; said device being a nonohmic device or a ceramic capacitor.
Claim 2
Independent Claim
120 words
A device comprising a layer, said layer comprising TiO 2 and at least two additives; and two electrical contacts to said layer; characterized in that a first said additive is at least one element selected from the group consisting of elements of Group IIA of the Periodic Table, said first additive being present in an amount greater than 0.0 mole percent and less than 1.0 mole percent and a second said additive is at least one element selected from the group consisting of elements of Group VB of the Periodic Table, said second additive being present in an amount greater than 0.0 mole percent and less than 5.0 mole percent; said device being a nonohmic device or a ceramic capacitor.
Claim 3
Dependent Claim
17 words
A device as recited in claim 1 in which said element selected from Group IIA is barium.
Claim 4
Dependent Claim
19 words
A device as recited in claim 2 in which said layer comprises between 0.15 and 0.3 mole percent barium.
Claim 5
Dependent Claim
19 words
A device as recited in claim 1 or 3 in which said element selected from Group VB is niobium.
Claim 6
Dependent Claim
19 words
A device as recited in claim 4 in which said layer comprises between 0.3 and 0.8 mole percent niobium.
Claim 7
Dependent Claim
30 words
A device as recited in claim 1 in which said element selected from Group IIA is strontium, said strontium being present in an amount between 0.1 and 0.3 mole percent.
Claim 8
Dependent Claim
17 words
A device as recited in claim 6 in which said element selected from Group VB is tantalum.
Claim 9
Dependent Claim
19 words
A device as recited in claim 7 in which said device comprises between 0.05 and 0.8 mole percent tantalum.
Claim 10
Dependent Claim
16 words
A device as recited in claim 6 in which said element from Group VB is niobium.
Claim 11
Dependent Claim
18 words
A device as recited in claim 9 in which said layer comprises 0.35 to 0.75 mole percent niobium.
Claim 12
Dependent Claim
18 words
A device as recited in claim 2 in which said layer comprises 0.1 to 1.0 mole percent barium.
Claim 13
Dependent Claim
17 words
A device as recited in claim 11 in which said element selected from Group VB is tantalum.
Claim 14
Dependent Claim
18 words
A device as recited in claim 12 in which said layer comprises 0.2 to 0.4 mole percent tantalum.
Claim 15
Dependent Claim
18 words
A device as recited in claim 12 in which said layer comprises 0.3 to 0.9 mole percent barium.
Claim 16
Dependent Claim
18 words
A device as recited in claim 14 in which said layer comprises 0.22 to 0.28 mole percent tantalum.
References Cited (Backward Citations)
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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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |