Patent US2501447A successfully refreshed from Google Patents.
US2501447A
Expired / Lapsed
US
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Calculating machine fractional
Assignee: —
•
Filing: —
•
Granted: 1950-03-21
•
Expires: 1967-03-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:56
CPC Classifications
G; G06; G06C; G06C7/00; G06C7/02; G06C7/08; G06C11/00; G06C11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1323381A
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US1369791A
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US1468992A
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US951266A
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US1025164A
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US1053687A
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US1302501A
Cited
US1370426A
Cited
US1424518A
Cited
US2208050A
Cited
US2348789A
Cited
US2339321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |