US2649580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric signaling system
Assignee: International Standard Electric Corp
•
Filing: 1950-09-19
•
Granted: 1953-08-18
•
Expires: 1970-09-19
Abstract
No abstract record available.
Inventors
- 👤 Dunn Roland Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:30
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; H04L5/24; H04L5/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1400039A
Cited
US2484218A
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US2466804A
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US2466803A
Cited
US2502215A
Cited
US2444950A
Cited
US2445840A
Cited
US2495652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |