Patent US2708690A successfully refreshed from Google Patents.
US2708690A
Expired / Lapsed
US
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Party line telephone systems
Assignee: Automatic Electric Laboratories Inc
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Filing: 1950-08-05
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Granted: 1955-05-17
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Expires: 1970-08-05
Abstract
No abstract record available.
Inventors
- 👤 Len B Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:03
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-16 | 1958-11-15 | 1959-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-16 | 1962-11-15 | 1963-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-16 | 1966-11-15 | 1967-05-17 | $7700.00 | Window Closed / Lapsed |