US3925802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device
Assignee: Mitsubishi Electric Corp
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Filing: 1974-02-21
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Granted: 1975-12-09
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Expires: 1994-02-21
Abstract
Abstract A hollow circularly cylindrical N semiconductor substrate includes a P layer disposed on its outer peripheral surface to form a PN junction in the form of a circularly cylindrical surface within the substrate. Two circularly cylindrical electrodes are fitted onto and into the substrate respectively.
Inventors
- 👤 Jinzo Watanabe
- 👤 Noboru Terao
- 👤 Koichi Kamahara
- 👤 Kazuhisa Miyashita
- 👤 Kenji Fujihira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:41
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/20; H10D; H10D99/00; H10W40/00; H10W40/40; H10W40/47
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A SEMICONDUCTOR EVICE COMPRISING, A TUBULAR SUBSTRATE OF SEMICONDUCTOR MATERIAL WITH ONE TYPE CONDUCTIVITY, AN ANNULAR INNER LAYER OF SEMICONDUCTOR MATERIAL OF AN OPPOSITE TUPE CONDUCTIVITY INTERNALLY OF SAID TUBULAR SUBSTRATE DEFINING A PN JUNCTION THEREBETWEEN, A TUBULAR CONDUCTIVE ANODE ELECTRODE BONDED INTERNALLY OF SAID ANNULAR INNER LAYER OF SEMICONDUCTOR MATERIAL AND OF GREATER AXIAL LENGTH THAN SAID ANNULAR LAYER AND SAID SUBSTRATE, AN N+ TYPE SEMICONDUCTOR ANNULAR OUTER LAYER CIRCUMFERENTIALLY OF SAID SUBSTRATE DEFINING AN NN+ JUNCTION THEREBETWEEN, A TUBULAR CONDUCTIVE CATHODE ELECTRODE CIRCUMFERENTIALLY OF THE LAST-MENTIONED LAYER AND OF LESSER AXIAL LENGTH, AND THE SUBSTRATE AND INNER AND OUTER LAYERS HAVING BEVELLED OUTER EDGES DEFINING IN AXIAL CROSS-SECTION TWO FRUSTO-CONICAL CONFIGURATIONS EACH HAVING A BASE ON A SIDE OPPOSITE THE LONGITUDINAL AXIS OF THE ANODE ELECTRODE.
Claim 2
Dependent Claim
128 words
A SEMICONDUCTOR EVICE COMPRISING, A TUBULAR SUBSTRATE OF SEMICONDUCTOR MATERIAL WITH ONE TYPE CONDUCTIVITY, AN ANNULAR INNER LAYER OF SEMICONDUCTOR MATERIAL OF AN OPPOSITE TUPE CONDUCTIVITY INTERNALLY OF SAID TUBULAR SUBSTRATE DEFINING A PN JUNCTION THEREBETWEEN, A TUBULAR CONDUCTIVE ANODE ELECTRODE BONDED INTERNALLY OF SAID ANNULAR INNER LAYER OF SEMICONDUCTOR MATERIAL AND OF GREATER AXIAL LENGTH THAN SAID ANNULAR LAYER AND SAID SUBSTRATE, AN N+ TYPE SEMICONDUCTOR ANNULAR OUTER LAYER CIRCUMFERENTIALLY OF SAID SUBSTRATE DEFINING AN NN+ JUNCTION THEREBETWEEN, A TUBULAR CONDUCTIVE CATHODE ELECTRODE CIRCUMFERENTIALLY OF THE LAST-MENTIONED LAYER AND OF LESSER AXIAL LENGTH, AND THE SUBSTRATE AND INNER AND OUTER LAYERS HAVING BEVELLED OUTER EDGES DEFINING IN AXIAL CROSS-SECTION TWO FRUSTO-CONICAL CONFIGURATIONS EACH HAVING A BASE ON A SIDE OPPOSITE THE LONGITUDINAL AXIS OF THE ANODE ELECTRODE.
Claim 3
Dependent Claim
35 words
A semiconductor device according to claim 1, in which each electrode is made of an electrically conductive material having a coefficient of expansion approximating the coefficient of expansion of the semiconductor material of said substrate.
Claim 4
Dependent Claim
43 words
A semiconductor device according to claim 1, including a layer brazing material bonding the anode electrode internally of said inner layer of semiconductor material, and a layer of brazing material bonding the cathode electrode to said outer layer of N type semiconductor material.
Claim 5
Dependent Claim
21 words
A semiconductor device according to claim 1, in which each layer, said substrate and both electrodes are circular in cross section.
Claim 6
Dependent Claim
13 words
A semiconductor device according to claim 1, in which each electrode is metallic.
Claim 7
Dependent Claim
21 words
A semiconductor device according to claim 1, in which said inner layer is a P-type layer and said substrate is N-type.
References Cited (Backward Citations)
US2890976A
Cited
US2877358A
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US3022472A
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US2975344A
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US3122655A
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US3173102A
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |