US2903519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic p.b.x system providing different classes of service
Assignee: Siemens and Halske AG
•
Filing: 1955-03-01
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Granted: 1959-09-08
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Expires: 1975-03-01
Abstract
No abstract record available.
Inventors
- 👤 Grohmann Walter
- 👤 Kurz Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:25
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2333474A
Cited
US2544944A
Cited
GB670062A
Cited
US2686840A
Cited
US2707727A
Cited
US2773939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |