US2441963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric impulse signaling system
Assignee: International Standard Electric Corp
•
Filing: 1941-12-19
•
Granted: 1948-05-25
•
Expires: 1961-12-19
Abstract
No abstract record available.
Inventors
- 👤 Gray Richard Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:18
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2118156A
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GB389855A
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US2061734A
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US2086918A
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US2110438A
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US2113214A
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US2266401A
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US2262838A
Cited
US2234978A
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US2272070A
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GB558343A
Cited
US2338512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-25 | 1951-11-24 | 1952-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-25 | 1955-11-24 | 1956-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-25 | 1959-11-24 | 1960-05-25 | $7700.00 | Window Closed / Lapsed |