US1870997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing telegraph exchange system
Assignee: Siemens and Halske AG
•
Filing: 1930-01-04
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Granted: 1932-08-09
•
Expires: 1950-01-04
Abstract
No abstract record available.
Inventors
- 👤 Jipp August
- 👤 Rossberg Ehrhard
- 👤 Simon Franz
- 👤 Scheunert Alfred
- 👤 Skawran Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:14
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/02; H04L12/06
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) | 1935-08-09 | 1936-02-08 | 1936-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-09 | 1940-02-08 | 1940-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-09 | 1944-02-08 | 1944-08-09 | $7700.00 | Window Closed / Lapsed |