Patent US2557900A successfully refreshed from Google Patents.
US2557900A
Expired / Lapsed
US
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Position indicator for use in blind flying of towed gliders
Assignee: Individual
•
Filing: 1947-10-31
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Granted: 1951-06-19
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Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert L Wallace
- 👤 Harold L Ericson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:02
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1889614A
Cited
US2170835A
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US2166991A
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US2403967A
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US2476301A
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US2449532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |