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US2731201A
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Assignee: International Business Machines Corp
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Filing: 1950-12-21
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Granted: 1956-01-17
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Expires: 1970-12-21
Abstract
No abstract record available.
Inventors
- 👤 Leonard R Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:49
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2420516A
Cited
US2536955A
Cited
US2521788A
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US2552781A
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US2539623A
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US2584363A
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US2575087A
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US2540442A
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US2540024A
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US2630969A
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US2531076A
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US2549779A
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US2591007A
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US2591961A
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US2644887A
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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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |