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US2567970A
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US
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Semiconductor comprising silicon and method of making it
Assignee: AT&T Inc
•
Filing: 1947-12-24
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Granted: 1951-09-18
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Expires: 1967-12-24
Abstract
No abstract record available.
Inventors
- 👤 Jack H Scaff
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:22
CPC Classifications
H; H10; H10P; H10P95/00; H10F; H10F99/00; H10P95/50; Y; Y10; Y10S; Y10S438/00; Y10S438/914; Y10S438/919; Y10S438/925
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2402582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |