US2454780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telecommunication switching system
Assignee: International Standard Electric Corp
•
Filing: 1943-08-28
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Granted: 1948-11-30
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Expires: 1963-08-28
Abstract
No abstract record available.
Inventors
- 👤 Gerald Deakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:18
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/274; H04M1/515; H04Q1/30; H04Q1/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2002219A
Cited
US1631625A
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US1982290A
Cited
US1819599A
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US2060184A
Cited
DE704414C
Cited
US2294464A
Cited
US2306087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |