Patent US2977258A successfully refreshed from Google Patents.
US2977258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of semiconductors and the like
Assignee: Lanteris Space LLC
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Filing: 1958-04-09
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Granted: 1961-03-28
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Expires: 1978-04-09
Abstract
No abstract record available.
Inventors
- 👤 Richard B Dunkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/02; C30B15/10; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S438/00; Y10S438/914; Y10S438/925; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1056; Y10T117/1068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD OF PRODUCING MONOCRYSTALLINE SEMICONDUCTOR CRYSTALS AND OF MINIMIZING DIFFERENCES OF RESISTIVITY BETWEEN PORTIONS THEREOF, WHICH METHOD COMPRISES: JOINTLY HORIZONTALLY ROTATING A POOL OF SEMICONDUCTOR CRYSTAL MELT AND A THICK, SOLID BLOCK OF HEAT CONDUCTIVE REFRACTORY MATERIAL WHICH UNDERLIES SAID POOL AND SUPPORTS THE SAME, MAINTAINING SAID POOL SHALLOW RELATIVE TO THE THICKNESS OF SAID UNDERLYING BLOCK, GENERALLY SEPARATING A CENTRAL PORTION OF THE ROTATING POOL FROM AN ANNULAR OUTER PORTION THEREOF WHILE ALLOWING LOCAL INTERCOMMUNICATION FROM THE OUTER TO THE INNER PORTION AND
Claim 2
Independent Claim
85 words
A METHOD OF PRODUCING MONOCRYSTALLINE SEMICONDUCTOR CRYSTALS AND OF MINIMIZING DIFFERENCES OF RESISTIVITY BETWEEN PORTIONS THEREOF, WHICH METHOD COMPRISES: JOINTLY HORIZONTALLY ROTATING A POOL OF SEMICONDUCTOR CRYSTAL MELT AND A THICK, SOLID BLOCK OF HEAT CONDUCTIVE REFRACTORY MATERIAL WHICH UNDERLIES SAID POOL AND SUPPORTS THE SAME, MAINTAINING SAID POOL SHALLOW RELATIVE TO THE THICKNESS OF SAID UNDERLYING BLOCK, GENERALLY SEPARATING A CENTRAL PORTION OF THE ROTATING POOL FROM AN ANNULAR OUTER PORTION THEREOF WHILE ALLOWING LOCAL INTERCOMMUNICATION FROM THE OUTER TO THE INNER PORTION AND
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |