Patent US2921905A successfully refreshed from Google Patents.
US2921905A
Expired / Lapsed
US
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Method of preparing material for semiconductor applications
Assignee: Westinghouse Electric Corp
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Filing: 1956-08-08
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Granted: 1960-01-19
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Expires: 1976-08-08
Abstract
No abstract record available.
Inventors
- 👤 Chang Hung-Chi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:51
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/40; C30B11/00; C30B13/00; C30B13/08; H; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
THE METHOD OF PREPARING A CYRSTALLINE PRODUCT COMPOSED OF A FIRST MATERIAL AND AN ELEMENT MORE VOLATILE THAN SAID FIRST MATERIAL, COMBINED THEREWITH, WHICH COMPRISES GENERATING IN A COMPLETELY CLOSED REACTION ZONE CONTAINING SAID FIRST MATERIAL IN NON-GASEOUS MASS, A GASEOUS ATMOSPHERE OF SAID MORE VOLATILE ELEMENT BY MAINTAINING A NON-GASEOUS MASS OF SAID MORE VOLATILE ELEMENT AT AN ELEVATED TEMPERATURE IN SAID ZONE, SAID MASS OF THE MORE VOLATILE ELEMENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO INSURE THAT A PORTION THEREOF REMAINS NONGASEOUS THROUGHOUT THE PROCESS, AND CONTROLLING THE LOWEST TEMPERATURE IN SAID ZONE INCLUDING THE FIRST MATERIAL AT A VALUE DETERMINED BY THE QUANTITY OF SAID MORE VOLATILE ELEMENT DESIRED IN THE RESULTANT PRODUCT, WHEREBY THE PRESSURE OF SAID GASEOUS ATMOSPHERE OF THE MORE VOLATILE ELEMENT IN SAID ZONE IS AT A PREDETERMINED VALUE AND IT COMBINES WITH THE FIRST MATERIAL TO PRODUCE THE CRYSTALLINE PRODUCT.
Claim 2
Independent Claim
149 words
THE METHOD OF PREPARING A CYRSTALLINE PRODUCT COMPOSED OF A FIRST MATERIAL AND AN ELEMENT MORE VOLATILE THAN SAID FIRST MATERIAL, COMBINED THEREWITH, WHICH COMPRISES GENERATING IN A COMPLETELY CLOSED REACTION ZONE CONTAINING SAID FIRST MATERIAL IN NON-GASEOUS MASS, A GASEOUS ATMOSPHERE OF SAID MORE VOLATILE ELEMENT BY MAINTAINING A NON-GASEOUS MASS OF SAID MORE VOLATILE ELEMENT AT AN ELEVATED TEMPERATURE IN SAID ZONE, SAID MASS OF THE MORE VOLATILE ELEMENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO INSURE THAT A PORTION THEREOF REMAINS NONGASEOUS THROUGHOUT THE PROCESS, AND CONTROLLING THE LOWEST TEMPERATURE IN SAID ZONE INCLUDING THE FIRST MATERIAL AT A VALUE DETERMINED BY THE QUANTITY OF SAID MORE VOLATILE ELEMENT DESIRED IN THE RESULTANT PRODUCT, WHEREBY THE PRESSURE OF SAID GASEOUS ATMOSPHERE OF THE MORE VOLATILE ELEMENT IN SAID ZONE IS AT A PREDETERMINED VALUE AND IT COMBINES WITH THE FIRST MATERIAL TO PRODUCE THE CRYSTALLINE PRODUCT.
References Cited (Backward Citations)
US2692839A
Cited
US2759861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |