US3214652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor comprising prong-shaped emitter electrode
Assignee: Motorola Solutions Inc
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Filing: 1962-03-19
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Granted: 1965-10-26
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Expires: 1982-03-19
Abstract
No abstract record available.
Inventors
- 👤 Knowles Carl Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:43
CPC Classifications
H; H10; H10D; H10D99/00; H10D10/00; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A TRANSISTOR DEVICE INCLUDING IN COMBINATION, A SEMICONDUCTOR CRYSTAL ELEMENT HAVING EMITTER, BASE AND COLLECTOR REGIONS OF ALTERNATE CONDUCTIVITY TYPE WITH RESPECTIVE RECTIFYING JUNCTIONS BETWEEN SAID REGIONS, SAID EMITTER REGION AND SAID BASE REGION BOTH EXTENDING TO THE SAME SURFACE OF SAID CRYSTAL ELEMENT, WITH SAID BASE REGION SURROUNDING SAID EMITTER REGION AT SAID SURFACE, SAID EMITTER REGION HAVING A CENTRAL PORTION AND A PLURALITY OF FINGER-LIKE PORTIONS PROJECTING RADIALLY FROM SAID CENTRAL PORTION SO THAT SAID EMITTER REGION HAS A RELATIVELY GREAT PERIMETER-TO-AREA RATIO AT SAID SURFACE, A FIRST METAL CONTACT TO SAID EMITTER REGION AT SAID SURFACE OF SAID CRYSTAL ELEMENT HAVING SUBSTANTIALLY THE SAME CONFIGURATION AS
Claim 2
Dependent Claim
109 words
A TRANSISTOR DEVICE INCLUDING IN COMBINATION, A SEMICONDUCTOR CRYSTAL ELEMENT HAVING EMITTER, BASE AND COLLECTOR REGIONS OF ALTERNATE CONDUCTIVITY TYPE WITH RESPECTIVE RECTIFYING JUNCTIONS BETWEEN SAID REGIONS, SAID EMITTER REGION AND SAID BASE REGION BOTH EXTENDING TO THE SAME SURFACE OF SAID CRYSTAL ELEMENT, WITH SAID BASE REGION SURROUNDING SAID EMITTER REGION AT SAID SURFACE, SAID EMITTER REGION HAVING A CENTRAL PORTION AND A PLURALITY OF FINGER-LIKE PORTIONS PROJECTING RADIALLY FROM SAID CENTRAL PORTION SO THAT SAID EMITTER REGION HAS A RELATIVELY GREAT PERIMETER-TO-AREA RATIO AT SAID SURFACE, A FIRST METAL CONTACT TO SAID EMITTER REGION AT SAID SURFACE OF SAID CRYSTAL ELEMENT HAVING SUBSTANTIALLY THE SAME CONFIGURATION AS
References Cited (Backward Citations)
US2924760A
Cited
US3044147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |