US3202887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mesa-transistor with impurity concentration in the base decreasing toward collector junction
Assignee: AT&T Inc
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Filing: 1961-05-15
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Granted: 1965-08-24
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Expires: 1981-05-15
Abstract
No abstract record available.
Inventors
- 👤 George C Dacey
- 👤 Charles A Lee
- 👤 Shockley William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
H; H10; H10D; H10D10/00; C; C30; C30B; C30B23/00; C30B31/00; C30B31/06; H10D30/00; H10D30/80; H10D62/00; H10D62/10; H10D62/60; H10D99/00; H10P; H10P32/00; H10P32/10; H10P32/12; H10P32/17; H10P32/171; H10P95/00; H10P95/50; Y; Y10; Y10S; Y10S252/00; Y10S252/95; Y10S252/951
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A JUNCTION TRANSISTOR COMPRISING A SEMICONDUCTIVE WAFER HAVING EMITTER, BASE AND COLLECTOR ZONES, THE EMITTER AND BASE ZONES BEING INCLUDED WITHIN A MESA LOCATED ON THE BULK PORTION OF THE WAFER, EMITTER, BASE AND COLLECTOR ELECTRODES CONNECTED TO THE EMITTER, BASE AND COLLECTOR ZONES, RESPECTIVELY, THE EMITTER ZONE HAVING A LINEAR GEOMETRY AND FORMING A MINOR PORTION OF ONE SURFACE OF THE MESA AND THE EMITTER ELECTRODE HAVING A LINEAR GEOMETRY AND EXTENDING ALONG THE SURFACE OF THE EMITTER ZONE, THE BASE ELECTRODE HAVING A LINEAR GEOMETRY AND EXTENDING ALONG SAID SURFACE OF THE MESA PARALLEL TO AND SUBSTANTIALLY COEXTENSIVE WITH THE EMITTER ELECTRODE, AND THE CONCENTRATION OF THE PREDOMINANT IMPURITY IN THE BASE ZONE VARYING FROM A RELATIVELY HIGH VALUE ADJACENT THE EMITTER ZONE TO A RELATIVELY LOW VALUE ADJACENT THE COLLECTOR ZONE.
Claim 2
Dependent Claim
134 words
A JUNCTION TRANSISTOR COMPRISING A SEMICONDUCTIVE WAFER HAVING EMITTER, BASE AND COLLECTOR ZONES, THE EMITTER AND BASE ZONES BEING INCLUDED WITHIN A MESA LOCATED ON THE BULK PORTION OF THE WAFER, EMITTER, BASE AND COLLECTOR ELECTRODES CONNECTED TO THE EMITTER, BASE AND COLLECTOR ZONES, RESPECTIVELY, THE EMITTER ZONE HAVING A LINEAR GEOMETRY AND FORMING A MINOR PORTION OF ONE SURFACE OF THE MESA AND THE EMITTER ELECTRODE HAVING A LINEAR GEOMETRY AND EXTENDING ALONG THE SURFACE OF THE EMITTER ZONE, THE BASE ELECTRODE HAVING A LINEAR GEOMETRY AND EXTENDING ALONG SAID SURFACE OF THE MESA PARALLEL TO AND SUBSTANTIALLY COEXTENSIVE WITH THE EMITTER ELECTRODE, AND THE CONCENTRATION OF THE PREDOMINANT IMPURITY IN THE BASE ZONE VARYING FROM A RELATIVELY HIGH VALUE ADJACENT THE EMITTER ZONE TO A RELATIVELY LOW VALUE ADJACENT THE COLLECTOR ZONE.
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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |