US2424554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical signaling system
Assignee: International Standard Electric Corp
•
Filing: 1943-03-01
•
Granted: 1947-07-29
•
Expires: 1963-03-01
Abstract
No abstract record available.
Inventors
- 👤 Cornu Pierre Lucien Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
G; G08; G08C; G08C25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1740485A
Cited
US1142252A
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US1719471A
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US1765475A
Cited
US1754239A
Cited
US2039405A
Cited
US2037565A
Cited
CH191697A
Cited
US2318364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |