Patent DE228239C successfully refreshed from Google Patents.
Patent US2646631A successfully refreshed from Google Patents.
US2646631A
Expired / Lapsed
US
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Combined abacus and counting rack
Assignee: Individual
•
Filing: 1947-01-22
•
Granted: 1953-07-28
•
Expires: 1967-01-22
Abstract
No abstract record available.
Inventors
- 👤 Lazar Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:15
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1233544A
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Cited
US2228554A
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US2457332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |