Patent US2883257A successfully refreshed from Google Patents.
US2883257A
Expired / Lapsed
US
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Electron beam recording
Assignee: AT&T Inc
•
Filing: 1953-05-15
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Granted: 1959-04-21
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Expires: 1973-05-15
Abstract
No abstract record available.
Inventors
- 👤 Herman G Wehe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:15
CPC Classifications
G; G03; G03G; G03G17/00; G01; G01D; G01D15/00; G01D15/14; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/143; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2221776A
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US2281638A
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US2478681A
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US2616961A
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US2716048A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |