US2887423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-conductor device
Assignee: Individual
•
Filing: 1957-06-10
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Granted: 1959-05-19
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Expires: 1977-06-10
Abstract
No abstract record available.
Inventors
- 👤 Beale Julian Robert Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:48
CPC Classifications
H; H10; H10P; H10P95/00; H10D; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A TRANSISTOR COMPRISING A SEMI-CONDUCTIVE BODY CONTAINING OPPOSED EMITTER AND COLLECTOR REGIONS OF GIVEN SIZE DEFINING THEREBETWEEN A BASE REGION OF GIVEN WIDTH AND POSSESSING A RESISTIVITY IN THE RANGE BETWEEN 0.5 AND 10 OHM-CM., AND EMITTER, COLLECTOR AND BASE CONTACTS TO THEIR RESPECTIVE REGIONS, SAID TRANSISTOR POSSESSING AN INTERNAL COLLECTOR CAPACITANCE OF LESS THAN 15 PICCOFARADS AT AN APPLIED VOLTAGE BETWEEN THE COLLECTOR AND BASE OF 3 VOLTS, THE SIZE OF THE EMITTER AND COLLECTOR REGIONS AND THE BASE WIDTH HAVING VALUES AT WHICH THE VALUE OF THE APPLIED VOLTAGE BETWEEN COLLECTOR AND EMITTER AT WHICH PUNCH-THROUGH OCCURS LIES BETWEEN THE COLLECTOR-BASE VOLTAGE VALUE AT WHICH AM EQUALS 1 AND THE COLLECTOR-BASE BREAKDOWN VOLTAGE, WHERE AM IS THE RATIO OF THE COLLECTOR CURRENT AND THE EMITTER CURRENT.
Claim 2
Dependent Claim
128 words
A TRANSISTOR COMPRISING A SEMI-CONDUCTIVE BODY CONTAINING OPPOSED EMITTER AND COLLECTOR REGIONS OF GIVEN SIZE DEFINING THEREBETWEEN A BASE REGION OF GIVEN WIDTH AND POSSESSING A RESISTIVITY IN THE RANGE BETWEEN 0.5 AND 10 OHM-CM., AND EMITTER, COLLECTOR AND BASE CONTACTS TO THEIR RESPECTIVE REGIONS, SAID TRANSISTOR POSSESSING AN INTERNAL COLLECTOR CAPACITANCE OF LESS THAN 15 PICCOFARADS AT AN APPLIED VOLTAGE BETWEEN THE COLLECTOR AND BASE OF 3 VOLTS, THE SIZE OF THE EMITTER AND COLLECTOR REGIONS AND THE BASE WIDTH HAVING VALUES AT WHICH THE VALUE OF THE APPLIED VOLTAGE BETWEEN COLLECTOR AND EMITTER AT WHICH PUNCH-THROUGH OCCURS LIES BETWEEN THE COLLECTOR-BASE VOLTAGE VALUE AT WHICH AM EQUALS 1 AND THE COLLECTOR-BASE BREAKDOWN VOLTAGE, WHERE AM IS THE RATIO OF THE COLLECTOR CURRENT AND THE EMITTER CURRENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |