Patent US2272070A successfully refreshed from Google Patents.
US2272070A
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US
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Electric signaling system
Assignee: International Standard Electric Corp
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Filing: 1939-11-22
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Granted: 1942-02-03
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Expires: 1959-11-22
Abstract
No abstract record available.
Inventors
- 👤 Reeves Alec Harley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/04; G; G01; G01S; G01S1/00; G01S1/02; H03; H03M; H03M1/00; H03M1/12; H03M1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-02-02 | 1945-08-04 | 1946-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-02 | 1949-08-04 | 1950-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-02 | 1953-08-04 | 1954-02-03 | $7700.00 | Window Closed / Lapsed |