US2864729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-conducting crystals for rectifiers and transistors and its method of preparation
Assignee: International Standard Electric Corp
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Filing: 1955-02-25
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Granted: 1958-12-16
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Expires: 1975-02-25
Abstract
No abstract record available.
Inventors
- 👤 Karl O Seiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:35
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10D; H10D99/00; H10P; H10P95/00; H10P95/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A JUNCTION TYPE SEMICONDUCTOR CRYSTAL COMPRISING TWO LAYERS OF SEMICONDUCTOR MATERIAL OF DIFFERENT ELECTRICAL PROPERTIES JOINED TOGETHER BY A JUNCTION LAYER CONSTITUTING A REGION OF TRANSITION BETWEEN SAID SEMICONDUCTOR LAYERS, THE ELECTRICAL PROPERTIES OF SAID LAYERS BEING DETERMINED BY THE NATURE OF IMPURITIES IN SAID LAYERS,N AND THE IMPURITY DENSITY BEING GREATEST IN SAID JUNCTION LAYER, CHARACTERIZED IN THAT THE DENSITY OF IMPURITIES IS GREATEST TOWARDS THE CENTER OF SAIDJUNCTION LAYER AND DECREASES TOWARDS THE PERIPHERAL SURFACE AREA THEREOF.
Claim 2
Dependent Claim
79 words
A JUNCTION TYPE SEMICONDUCTOR CRYSTAL COMPRISING TWO LAYERS OF SEMICONDUCTOR MATERIAL OF DIFFERENT ELECTRICAL PROPERTIES JOINED TOGETHER BY A JUNCTION LAYER CONSTITUTING A REGION OF TRANSITION BETWEEN SAID SEMICONDUCTOR LAYERS, THE ELECTRICAL PROPERTIES OF SAID LAYERS BEING DETERMINED BY THE NATURE OF IMPURITIES IN SAID LAYERS,N AND THE IMPURITY DENSITY BEING GREATEST IN SAID JUNCTION LAYER, CHARACTERIZED IN THAT THE DENSITY OF IMPURITIES IS GREATEST TOWARDS THE CENTER OF SAIDJUNCTION LAYER AND DECREASES TOWARDS THE PERIPHERAL SURFACE AREA THEREOF.
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) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |