US2572030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Failure alarm arrangements in multichannel carrier current communication system
Assignee: International Standard Electric Corp
•
Filing: 1948-03-25
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Granted: 1951-10-23
•
Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jacobsen Bent Bulow
- 👤 Fairley Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:49
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2371263A
Cited
US1804526A
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US2059870A
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US2379069A
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US2396990A
Cited
US2460789A
Cited
US2478320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |