Patent US2486809A successfully refreshed from Google Patents.
US2486809A
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Biquinary system calculator
Assignee: AT&T Inc
•
Filing: 1945-09-29
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Granted: 1949-11-01
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Expires: 1965-09-29
Abstract
No abstract record available.
Inventors
- 👤 George R Stibitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:18
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/40; G06F7/44; G06F7/443
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2185681A
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US2176934A
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US2099754A
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US2253596A
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US2210574A
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US2386763A
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US2402988A
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US2364540A
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US2420167A
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US2424100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-31 | 1953-05-02 | 1953-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-31 | 1957-05-02 | 1957-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-31 | 1961-05-02 | 1961-11-01 | $7700.00 | Window Closed / Lapsed |