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US2424585A
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US
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Telecommunication system
Assignee: International Standard Electric Corp
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Filing: 1943-01-16
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Granted: 1947-07-29
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Expires: 1963-01-16
Abstract
No abstract record available.
Inventors
- 👤 Stephane Simon
- 👤 Jacob Kruithof
- 👤 Hertog Martinus Den
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:21
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2267950A
Cited
US2270246A
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US2284870A
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US2319424A
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US2252766A
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US2306729A
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 |