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Patent US2761750A successfully refreshed from Google Patents.
US2761750A
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Rotary card filing device and card backing means therein
Assignee: Zephyr American Corp
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Filing: 1951-07-03
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Granted: 1956-09-04
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Expires: 1971-07-03
Abstract
No abstract record available.
Inventors
- 👤 Hildaur L Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:31
CPC Classifications
A; A47; A47B; A47B63/00; A47B63/06; A47B63/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US597759A
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US1315898A
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US704003A
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US1358331A
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US1476157A
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US1596741A
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US2384355A
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US2486820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |