US2890139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-conductive material purification method and apparatus
Assignee: Individual
•
Filing: 1956-12-10
•
Granted: 1959-06-09
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Shockley William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:18
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/037; C30; C30B; C30B11/00; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
THE METHOD OF PURIFYING SEMI-CONDUCTIVE MATERIAL WHICH COMPRISES THE STEPS OF MAINTAINING THE MATERIAL AT A TEMPERATURE SLIGHTLY BELOW ITS MELTING POINT, APPLYING HEAT TO A PREDETERMINED SMALL AREA OF THE SURFACE WHEREBY THE MATERIAL MELTS TO FORM A PUDDLE, PROGRESSIVELY INCREASING THE SIZE OF THE PUDDLE UNTIL A PREDETERMINED SIZE IS REACHED, PROGRESSIVELY SOLIDIFYING THE MATERIAL WHEREBY THE SIZE OF TH PUDDLE IS PROGRESSIVELY REDUCED, AND REMOVING MOLTEN MATERIAL WHEN THE SIZE OF THE PUDDLE REACHES A PREDETERMINED SMALL VOLUME.
References Cited (Backward Citations)
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US2640860A
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US2703296A
Cited
US2615060A
Cited
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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) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |