Patent US2588005A successfully refreshed from Google Patents.
US2588005A
Expired / Lapsed
US
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Approach control in coded track circuit signaling systems
Assignee: SPX Technologies Inc
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Filing: 1945-06-16
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Granted: 1952-03-04
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Expires: 1965-06-16
Abstract
No abstract record available.
Inventors
- 👤 James Y Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:52
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1875859A
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US1877562A
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US2058610A
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US2045992A
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US2083920A
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US2077932A
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US2158016A
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US2176605A
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US2285881A
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US2396134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |