US2952732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric signalling systems
Assignee: International Standard Electric Corp
•
Filing: 1954-06-01
•
Granted: 1960-09-13
•
Expires: 1974-06-01
Abstract
No abstract record available.
Inventors
- 👤 Wright Esmond Philip Goodwin
- 👤 Weir Donald Adams
- 👤 Rice Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:32
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/54; G; G06; G06F; G06F7/00; G06F7/02; H04L13/00; H04L13/02; H04L13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2454301A
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US2632044A
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US2540654A
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US2570279A
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US2546627A
Cited
US2667533A
Cited
US2614169A
Cited
US2714626A
Cited
US2770797A
Cited
US2818322A
Cited
US2703338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |