US1872842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call recording and charging system
Assignee: Siemens and Halske AG
•
Filing: 1931-03-11
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Granted: 1932-08-23
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Expires: 1951-03-11
Abstract
No abstract record available.
Inventors
- 👤 Storch Paul
- 👤 Rossberg Ehrhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:29
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/02; H04L12/14; H04L12/1432; H04L12/1439; H04L12/1485; H04M; H04M15/00; H04M15/38
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) | 1935-08-23 | 1936-02-22 | 1936-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-23 | 1940-02-22 | 1940-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-23 | 1944-02-22 | 1944-08-23 | $7700.00 | Window Closed / Lapsed |