Patent US2822493A successfully refreshed from Google Patents.
US2822493A
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Graphechon storage tube
Assignee: Individual
•
Filing: 1953-04-24
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Granted: 1958-02-04
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Expires: 1973-04-24
Abstract
No abstract record available.
Inventors
- 👤 Maurice D Harsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:57
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/58; H01J31/60; H01J31/62; H01J31/64; H01J29/00; H01J29/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2493539A
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US2567359A
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US2495042A
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US2582843A
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US2706264A
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US2590764A
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US2646521A
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US2598919A
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US2611100A
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US2644855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |