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US2739185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone system
Assignee: Siemens and Halske AG
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Filing: 1952-02-28
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Granted: 1956-03-20
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Expires: 1972-02-28
Abstract
No abstract record available.
Inventors
- 👤 Panzerbieter Hans
- 👤 Hans Dipl-Ing Panzerbieter
- 👤 Kurt Dipl-Ing Hagenhaus
- 👤 Hans-Joachim Dipl-I Jabczynski
- 👤 Gerd Tiesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:49
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |