US2951964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam systems
Assignee: AT&T Inc
•
Filing: 1955-09-13
•
Granted: 1960-09-06
•
Expires: 1975-09-13
Abstract
No abstract record available.
Inventors
- 👤 Calvin F Quate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:12
CPC Classifications
H; H01; H01J; 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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US2575383A
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US2801361A
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FR991909A
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FR993101A
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US2725499A
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US2622158A
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US2774913A
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US2730678A
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US2746036A
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GB730687A
Cited
US2889486A
Cited
US2809320A
Cited
US2857548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |