US2591074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hyperbolic position locating device
Assignee: International Business Machines Corp
•
Filing: 1945-02-21
•
Granted: 1952-04-01
•
Expires: 1965-02-21
Abstract
No abstract record available.
Inventors
- 👤 Reynold B Johnson
- 👤 Hendrich Henry Alfred
- 👤 Gustav V A Malmros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:27
CPC Classifications
G; G06; G06G; G06G3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1529293A
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US1001658A
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US1191906A
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US1370645A
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GB176676A
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US1615668A
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DE640276C
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US2197505A
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US2341107A
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US2422025A
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US2493786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |