US2926418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Point contact semiconductor forming method
Assignee: Sprague Electric Co
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Filing: 1955-08-19
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Granted: 1960-03-01
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Expires: 1975-08-19
Abstract
No abstract record available.
Inventors
- 👤 Zuleeg Rainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:12
CPC Classifications
H; H10; H10W; H10W99/00; H10D; H10D48/00; H10D48/30; H10D48/32; H10D48/34; H10D48/345; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/071
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF FORMING A GERMANIUM TRANSISTOR HAVING A POINT-CONTACT COLLECTOR ELECTRODE, WHICH METHOD IS CHARACTERIZED BY THE STEP OF APPLYING BETWEEN THE COLLECTOR AND THE GERMANIUM AN ISOLATED REVERSE CURRENT PULSE AT LEAST ABOUT 50 MICROSECONDS LONG, THE PULSE HAVING A VOLTAGE WITH AN INITIAL VALUE OF FROM 400 TO 1500 VOLTS AND AFTER BARRIER BREAKDOWN AT THE COLLECTOR POINT, DROPS TO A LEVEL SUCH THAT THE CURRENT REMAINS ABOUT CONSTANT FOR THE ENTIRE PULSE.
Claim 2
Independent Claim
76 words
THE METHOD OF FORMING A GERMANIUM TRANSISTOR HAVING A POINT-CONTACT COLLECTOR ELECTRODE, WHICH METHOD IS CHARACTERIZED BY THE STEP OF APPLYING BETWEEN THE COLLECTOR AND THE GERMANIUM AN ISOLATED REVERSE CURRENT PULSE AT LEAST ABOUT 50 MICROSECONDS LONG, THE PULSE HAVING A VOLTAGE WITH AN INITIAL VALUE OF FROM 400 TO 1500 VOLTS AND AFTER BARRIER BREAKDOWN AT THE COLLECTOR POINT, DROPS TO A LEVEL SUCH THAT THE CURRENT REMAINS ABOUT CONSTANT FOR THE ENTIRE PULSE.
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) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |