Patent US2953707A successfully refreshed from Google Patents.
US2953707A
Expired / Lapsed
US
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Electron beam focusing system
Assignee: AT&T Inc
•
Filing: 1957-03-29
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Granted: 1960-09-20
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Expires: 1977-03-29
Abstract
No abstract record available.
Inventors
- 👤 John S Cook
- 👤 William H Louisell
- 👤 Willis H Yocom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:26
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J23/00; H01J23/02; H01J23/08; H01J23/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2687491A
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US2638561A
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US2680823A
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US2790106A
Cited
US2807739A
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US2849650A
Cited
US2857548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |