US1929216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling electrical circuits by means of electrical valves
Assignee: Siemens and Halske AG
•
Filing: 1931-04-01
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Granted: 1933-10-03
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Expires: 1951-04-01
Abstract
No abstract record available.
Inventors
- 👤 Pfannenmuller Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:53
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12
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) | 1936-10-02 | 1937-04-03 | 1937-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-02 | 1941-04-03 | 1941-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-02 | 1945-04-03 | 1945-10-03 | $7700.00 | Window Closed / Lapsed |