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Patent US3284172A successfully refreshed from Google Patents.
US3284172A
Expired / Lapsed
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Apparatus and process for preparing semiconductor rods
Assignee: Monsanto Co
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Filing: 1964-10-13
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Granted: 1966-11-08
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Expires: 1984-10-13
Abstract
No abstract record available.
Inventors
- 👤 Richard J Binder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:05
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/20; C30B15/22; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/20; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1004; Y10T117/1008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
IN A METHOD OF MELT DRAWING A MONO-CRYSTALLINE SEMICONDUCTOR ROD WHEREIN A SEMICONDUCTOR MATERIAL IS MELTED WITHIN A SUSCEPTOR BY USE OF INDUCTIVE HEATING THROUGH THE MEDIUM OF A WORK COIL ENERGIZED BY A HIGH FREQUENCY ELECTRICAL SOURCE, AND THEREAFTER DRAWING SAID SEMICONDUCTOR MATERIAL INTO ROD FORM FROM SAID MELT BY MEANS OF A MECHANICAL ARRANGEMENT WHILE CONTROLLING THE TEMPERATURE OF SAID MELT BY SENSING TEMPERATURE FLUCTUATIONS IN SAID MELT, CONVERTING SAID TEMPERATURE FLUCTUATIONS TO AN ERROR VOLTAGE REPRESENTING THE DFFERENCE BETWEEN THE FLUCTUATED TEMPERATURE AND A DESIRED TEMPERATURE, AND UTILIZING SAID ERROR VOLTAGE TO CONTROL THE POWER SOURCE TO SAID HIGH FREQUENCY ENERGY SOURCE AND THEREBY CONTROL THE POWER IN SAID WORK COIL, THE IMPROVEMENT WHICH COMPRISES UTILIZING CHANGES IN THE VOLTAGES OF SAID WORK COIL WITHOUT MATERIALLY INFLUENCINNG SAID VOLTAGE BY SUMMING WITH SAID ERROR VOLTAGE TO STABILIZE THE POWER IN SAID WORK COIL AND THEREBY STABILIZE THE TEMPERATURE OF SAID MELT.
Claim 2
Dependent Claim
154 words
IN A METHOD OF MELT DRAWING A MONO-CRYSTALLINE SEMICONDUCTOR ROD WHEREIN A SEMICONDUCTOR MATERIAL IS MELTED WITHIN A SUSCEPTOR BY USE OF INDUCTIVE HEATING THROUGH THE MEDIUM OF A WORK COIL ENERGIZED BY A HIGH FREQUENCY ELECTRICAL SOURCE, AND THEREAFTER DRAWING SAID SEMICONDUCTOR MATERIAL INTO ROD FORM FROM SAID MELT BY MEANS OF A MECHANICAL ARRANGEMENT WHILE CONTROLLING THE TEMPERATURE OF SAID MELT BY SENSING TEMPERATURE FLUCTUATIONS IN SAID MELT, CONVERTING SAID TEMPERATURE FLUCTUATIONS TO AN ERROR VOLTAGE REPRESENTING THE DFFERENCE BETWEEN THE FLUCTUATED TEMPERATURE AND A DESIRED TEMPERATURE, AND UTILIZING SAID ERROR VOLTAGE TO CONTROL THE POWER SOURCE TO SAID HIGH FREQUENCY ENERGY SOURCE AND THEREBY CONTROL THE POWER IN SAID WORK COIL, THE IMPROVEMENT WHICH COMPRISES UTILIZING CHANGES IN THE VOLTAGES OF SAID WORK COIL WITHOUT MATERIALLY INFLUENCINNG SAID VOLTAGE BY SUMMING WITH SAID ERROR VOLTAGE TO STABILIZE THE POWER IN SAID WORK COIL AND THEREBY STABILIZE THE TEMPERATURE OF SAID MELT.
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |