US2730470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making semi-conductor crystals
Assignee: AT&T Inc
•
Filing: 1950-06-15
•
Granted: 1956-01-10
•
Expires: 1970-06-15
Abstract
No abstract record available.
Inventors
- 👤 Shockley William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:49
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/08; C30B13/00; C30B13/14; C30B29/06; H; H10; H10P; H10P90/00; H10P90/12; Y; Y10; Y10S; Y10S438/00; Y10S438/914; Y10S438/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF MAKING A SEMICONDUCTIVE CRYSTAL WHICH COMPRISES MELTING A MASS OF SEMICONDUCTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF GERMANIUM AND SILICON AND CONTAINING A CONDUCTIVITY TYPE DETERMINING IMPURITY HAVING A BOILING POINT BELOW THAT OF SAID MATERIAL INSERTING A SEED OF SAID MATERIAL INTO SAID MASS, WITHDRAWING SAID SEED AT A RATE TO WITHDRAW SOME OF SAID MASS ALONG THEREWITH, CONCOMITANTLY WITH THE WITHDRAWAL OF SAID SEED INCREASING THE TEMPERATURE OF THE REMAINING MASS THEREBY TO INCREASE THE RATE OF VAPORIZATION OF SAID IMPURITY THEREFROM AND REDUCE THE CONCENTRATION OF SAID IMPURITY IN THE REMAINING MASS, CONTINUING WITHDRAWAL OF SAID SEED AT SAID RATE FOLLOWING SAID INCREASING OF THE TEMPERATURE, AND COOLING THE WITHDRAWN MATERIAL TO SOLIDIFICATION.
Claim 2
Independent Claim
120 words
THE METHOD OF MAKING A SEMICONDUCTIVE CRYSTAL WHICH COMPRISES MELTING A MASS OF SEMICONDUCTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF GERMANIUM AND SILICON AND CONTAINING A CONDUCTIVITY TYPE DETERMINING IMPURITY HAVING A BOILING POINT BELOW THAT OF SAID MATERIAL INSERTING A SEED OF SAID MATERIAL INTO SAID MASS, WITHDRAWING SAID SEED AT A RATE TO WITHDRAW SOME OF SAID MASS ALONG THEREWITH, CONCOMITANTLY WITH THE WITHDRAWAL OF SAID SEED INCREASING THE TEMPERATURE OF THE REMAINING MASS THEREBY TO INCREASE THE RATE OF VAPORIZATION OF SAID IMPURITY THEREFROM AND REDUCE THE CONCENTRATION OF SAID IMPURITY IN THE REMAINING MASS, CONTINUING WITHDRAWAL OF SAID SEED AT SAID RATE FOLLOWING SAID INCREASING OF THE TEMPERATURE, AND COOLING THE WITHDRAWN MATERIAL TO SOLIDIFICATION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |