US2993762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing silicon of high purity
Assignee: International Standard Electric Corp
•
Filing: 1957-10-07
•
Granted: 1961-07-25
•
Expires: 1977-10-07
Abstract
No abstract record available.
Inventors
- 👤 Sterling Henley Frank
- 👤 Bush Eric Langley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/06; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/027; C01B33/029; C30B25/00; C30B25/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
135 words
A PROCESS FOR MANUFACTURE OF SUBSTANTIALLY PURE SILICON WHICH COMPRISES PASSING SUBSTANTIALLY PURE SILANCE INTO A ZONE BOUNDED BY A HORIZONTAL SUBSTANTIALLY CIRCULAR CONCENTRATOR COIL AND THE SURFACE OF A SILICON ROD OR SEED MAINTAINED SUBSTANTIALLY LEVEL WITH THE LOWER SURFACE OF THE COIL, THE SAID COIL AND THE SAID ROD OF SEED BEING ENCLOSED IN A DECOMPOSITION CHAMBER, APPLYING A HIGHFREQUENCY ALTERNATING CURRENT TO THE COIL OF SUCH MAGNITUDE AS TO MAINTAIN THE TEMPERATURE OF THE FIRST-MENTIONED SURFACE BETWEEN 1050*C. TO 1150*C., WHEREBY THE SILANCE IS THERMALLY DECOMPOSED ANDS SILICON IS DEPOSITED ON THE SAID FIRST-MENTIONED SURFACE, ADJUSTING THE PRESSURE IN THE DECOMPOSITION CHAMBER TO A VALUE LAYING BETWEEN 8 MM. HG AND 17 MM. HG, AND MAINTAINING THE FLOW OF THE SILANCE AT A RATE LYING BETWEEN 12 AND 25 LITRES PER HOUR.
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) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |