US2863090A
Expired / Lapsed
US
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R. f. modulation system for barrier grid storage tubes
Assignee: International Business Machines Corp
•
Filing: 1953-05-26
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Granted: 1958-12-02
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Expires: 1973-05-26
Abstract
No abstract record available.
Inventors
- 👤 Donald R Young
- 👤 Jr Ralph B De Lano
- 👤 Gerald L Shultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:52
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/23; H; H01; H01J; H01J31/00; H01J31/08; H01J31/58; H01J31/60
Claims Analysis
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References Cited (Backward Citations)
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US2716188A
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US2767345A
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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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |