Patent US3423539A successfully refreshed from Google Patents.
US3423539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone exchange switching systems
Assignee: The General Electric Company PLC
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Filing: 1965-11-05
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Granted: 1969-01-21
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Expires: 1985-11-05
Abstract
No abstract record available.
Inventors
- 👤 Peter Colin Page
- 👤 Ronald Frank Rous
- 👤 Paul Sigrist
- 👤 Peter William Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:21
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2562123A
Cited
US3328534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |