Patent US2551119A successfully refreshed from Google Patents.
US2551119A
Expired / Lapsed
US
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Electronic commutator
Assignee: International Business Machines Corp
•
Filing: 1948-07-09
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Granted: 1951-05-01
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Expires: 1968-07-09
Abstract
No abstract record available.
Inventors
- 👤 Jerrier A Haddad
- 👤 Ralph L Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:48
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2402989A
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US2306386A
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US2324314A
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US2426454A
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US2366357A
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US2409689A
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US2384379A
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US2403918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |