Patent US2944875A successfully refreshed from Google Patents.
US2944875A
Expired / Lapsed
US
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Crystal-growing apparatus and methods
Assignee: Raytheon Co
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Filing: 1953-07-13
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Granted: 1960-07-12
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Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 Walter F Leverton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:44
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/10; C30B15/12; Y; Y10; Y10S; Y10S117/00; Y10S117/911; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1052
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A CRYSTAL-GROWING APPARATUS COMPRISING A FIRST CONTAINER HAVING A RECESS THEREIN ADAPTED TO RECEIVE AN INITIAL MELT OF SEMICONDUCTOR MATERIAL, A SECOND CONTAINER MOVABLY DISPOSED WITHIN SAID RECESS IN SAID FIRST CONTAINER AND ADAPTED TO FLOAT IN SAID INITIAL MELT, SAID SECOND CONTAINER HAVING A RECESS THEREIN ADAPTED TO RECEIVE A PORTION OF SAID INITIAL MELT AND A PREDETERMINED CONCENTRATION OF DOPING AGENT, AND AN OPENING THROUGH A WALL THEREOF, THE SIZE OF SAID OPENING CAUSING THE REMAINDER OF SAID INITIAL MELT TO PASS SLOWLY INTO SAID SECOND CONTAINER AND PREVENTING SAID PORTION THEREIN FROM EFFECTIVE
Claim 2
Dependent Claim
96 words
A CRYSTAL-GROWING APPARATUS COMPRISING A FIRST CONTAINER HAVING A RECESS THEREIN ADAPTED TO RECEIVE AN INITIAL MELT OF SEMICONDUCTOR MATERIAL, A SECOND CONTAINER MOVABLY DISPOSED WITHIN SAID RECESS IN SAID FIRST CONTAINER AND ADAPTED TO FLOAT IN SAID INITIAL MELT, SAID SECOND CONTAINER HAVING A RECESS THEREIN ADAPTED TO RECEIVE A PORTION OF SAID INITIAL MELT AND A PREDETERMINED CONCENTRATION OF DOPING AGENT, AND AN OPENING THROUGH A WALL THEREOF, THE SIZE OF SAID OPENING CAUSING THE REMAINDER OF SAID INITIAL MELT TO PASS SLOWLY INTO SAID SECOND CONTAINER AND PREVENTING SAID PORTION THEREIN FROM EFFECTIVE
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US2647043A
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US2754180A
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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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |