US2517259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for call control in two-way systems with selector installation
Assignee: FIRM AUTOPHON AG
•
Filing: 1945-01-20
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Granted: 1950-08-01
•
Expires: 1965-01-20
Abstract
No abstract record available.
Inventors
- 👤 Tschumi Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:11
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/50; H01H13/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1044538A
Cited
US1012066A
Cited
US1109919A
Cited
US1372437A
Cited
US1975932A
Cited
US2054933A
Cited
US2044305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |