Patent US2402582A successfully refreshed from Google Patents.
US2402582A
Expired / Lapsed
US
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Preparation of silicon materials
Assignee: AT&T Inc
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Filing: 1941-04-04
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Granted: 1946-06-25
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Expires: 1961-04-04
Abstract
No abstract record available.
Inventors
- 👤 Jack H Scaff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
F; F16; F16G; F16G11/00; F16G11/12; C; C01; C01B; C01B33/00; C01B33/02; H; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S117/906; Y10T; Y10T117/00; Y10T117/10; Y10T117/1004; Y10T117/1012; Y10T117/1024; Y10T117/1092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-06-24 | 1949-12-24 | 1950-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-24 | 1953-12-24 | 1954-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-24 | 1957-12-24 | 1958-06-25 | $7700.00 | Window Closed / Lapsed |