Patent US2543906A successfully refreshed from Google Patents.
US2543906A
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US
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Perforated record analyzing means with removable brush holder
Assignee: International Business Machines Corp
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Filing: 1947-02-07
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Granted: 1951-03-06
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Expires: 1967-02-07
Abstract
No abstract record available.
Inventors
- 👤 Eugene A Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:24
CPC Classifications
H; H01; H01H; H01H43/00; H01H43/24; Y; Y10; Y10S; Y10S439/00; Y10S439/93
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1478691A
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US1839398A
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US2053069A
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US2056361A
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US2111118A
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US2129764A
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US2203013A
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US2353061A
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US2372882A
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US2379226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |