Patent US2431043A successfully refreshed from Google Patents.
US2431043A
Expired / Lapsed
US
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Typewriter rhythm recorder
Assignee: International Business Machines Corp
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Filing: 1944-01-20
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Granted: 1947-11-18
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Expires: 1964-01-20
Abstract
No abstract record available.
Inventors
- 👤 Carlton T Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:37
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/38; B41J29/393
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US474773A
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US734937A
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US840554A
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US1399429A
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US1253305A
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US1397740A
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US1651102A
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US2067185A
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US2337553A
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US2348744A
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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) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |