Patent US2665069A successfully refreshed from Google Patents.
US2665069A
Expired / Lapsed
US
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Equation solving mechanism
Assignee: Librascope Inc
•
Filing: 1947-05-07
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Granted: 1954-01-05
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Expires: 1967-05-07
Abstract
No abstract record available.
Inventors
- 👤 Lewis W Imm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:16
CPC Classifications
G; G06; G06G; G06G3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1292085A
Cited
US1529817A
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GB284804A
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US2040918A
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US2194477A
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US2401447A
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US2505258A
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US2349118A
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US2438112A
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US2472129A
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US2460638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |