US2540156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric signaling system
Assignee: International Standard Electric Corp
•
Filing: 1947-06-07
•
Granted: 1951-02-06
•
Expires: 1967-06-07
Abstract
No abstract record available.
Inventors
- 👤 Wright Esmond Philip Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:12
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/45; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2117580A
Cited
GB374831A
Cited
GB375349A
Cited
US2225680A
Cited
US2206538A
Cited
US2319339A
Cited
US2395132A
Cited
US2395693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |