Patent US2427463A successfully refreshed from Google Patents.
US2427463A
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Apparatus for making computations electrically
Assignee: Douglas Aircraft Co Inc
•
Filing: 1943-05-10
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Granted: 1947-09-16
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Expires: 1963-05-10
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang B Klemperer
- 👤 Everett H Pier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:13
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US889989A
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US1559325A
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US1869209A
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US2277285A
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US2080186A
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US2319106A
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US2244369A
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US2306456A
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US2401779A
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US2401527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-15 | 1951-03-17 | 1951-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-15 | 1955-03-17 | 1955-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-15 | 1959-03-17 | 1959-09-16 | $7700.00 | Window Closed / Lapsed |