US1906441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifying electrical impulses
Assignee: General Electric Co
•
Filing: 1928-10-17
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Granted: 1933-05-02
•
Expires: 1948-10-17
Abstract
No abstract record available.
Inventors
- 👤 Ernst F W Alexanderson
- 👤 Ray D Kell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/50
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) | 1936-05-01 | 1936-10-31 | 1937-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-05-01 | 1940-10-31 | 1941-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-05-01 | 1944-10-31 | 1945-05-02 | $7700.00 | Window Closed / Lapsed |