US2861905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling excess carrier concentration in a semiconductor
Assignee: AT&T Inc
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Filing: 1957-06-25
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Granted: 1958-11-25
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Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 George S Indig
- 👤 William G Pfann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:25
CPC Classifications
H; H10; H10P; H10P95/00; C; C30; C30B; C30B13/00; C30B15/00; C30B29/00; C30B29/02; C30B29/08; Y; Y10; Y10S; Y10S420/00; Y10S420/903; Y10S438/00; Y10S438/914; Y10S438/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS OF CRYSTALLIZING SEMICONDUCTIVE MATERIAL EVIDENCING UNIFORM ELECTRICAL CONDUCTIVITY CHARACTERISTICS FROM A BODY OF LIQUID COMPRISING AS A MAJOR INGREDIENT A FUSIBLE EXTRINSIC SEMICONDUCTIVE MATERIAL, AND AS MINOR INGREDIENTS, TWO SIGNIFICANT SOLUTES, SUCH THAT ONE OF THE CHARACTERISTICS, (A) THE CONDUCTIVITY IMPARTING TYPE, AND (B) THE SIGN OF THE QUANTITY (1-K), IS OPPOSITE FOR THE TWO SOLUTES, AND THE OTHER IS THE SAME FOR THE TWO SOLUTES, IN WHICH THE RATIO OF THE CONCENTRATION OF SOLUTE 2 IN THE LIQUID TO THAT OF SOLUTE 1 IS FROM 0.8 TO 1.2 TIMES THE ABSOLUTE VALUE OF R* WHERE R* IS THE RATIO OF THE GROWTH RATE COEFFICIENT OF THE DISTRIBUTION COEFFICIENT OF SOLUTE 1 TO THAT OF SOLUTE 2 AND IN WHICH K IS THE EFFECTIVE DISTRIBUTION COEFFICIENT.
Claim 2
Dependent Claim
128 words
A PROCESS OF CRYSTALLIZING SEMICONDUCTIVE MATERIAL EVIDENCING UNIFORM ELECTRICAL CONDUCTIVITY CHARACTERISTICS FROM A BODY OF LIQUID COMPRISING AS A MAJOR INGREDIENT A FUSIBLE EXTRINSIC SEMICONDUCTIVE MATERIAL, AND AS MINOR INGREDIENTS, TWO SIGNIFICANT SOLUTES, SUCH THAT ONE OF THE CHARACTERISTICS, (A) THE CONDUCTIVITY IMPARTING TYPE, AND (B) THE SIGN OF THE QUANTITY (1-K), IS OPPOSITE FOR THE TWO SOLUTES, AND THE OTHER IS THE SAME FOR THE TWO SOLUTES, IN WHICH THE RATIO OF THE CONCENTRATION OF SOLUTE 2 IN THE LIQUID TO THAT OF SOLUTE 1 IS FROM 0.8 TO 1.2 TIMES THE ABSOLUTE VALUE OF R* WHERE R* IS THE RATIO OF THE GROWTH RATE COEFFICIENT OF THE DISTRIBUTION COEFFICIENT OF SOLUTE 1 TO THAT OF SOLUTE 2 AND IN WHICH K IS THE EFFECTIVE DISTRIBUTION COEFFICIENT.
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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |