US3002320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silicon material
Assignee: AT&T Inc
•
Filing: 1956-12-13
•
Granted: 1961-10-03
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Expires: 1976-12-13
Abstract
No abstract record available.
Inventors
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:41
CPC Classifications
C; C22; C22B; C22B5/00; C30; C30B; C30B13/00; H; H10; H10D; H10D99/00; Y; Y10; Y10S; Y10S117/00; Y10S117/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2631356A
Cited
US2735138A
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US2443542A
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US2475810A
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US2425666A
Cited
US2539625A
Cited
US2667722A
Cited
GB762982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |