US2158248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical amplifying system and method of operation
Assignee: Individual
•
Filing: 1934-09-11
•
Granted: 1939-05-16
•
Expires: 1954-09-11
Abstract
No abstract record available.
Inventors
- 👤 Numans Johannes Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:14
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F3/00; H03F3/20; H03F3/22; H03F3/26; H03F3/28
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) | 1942-05-15 | 1942-11-14 | 1943-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-15 | 1946-11-14 | 1947-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-15 | 1950-11-14 | 1951-05-16 | $7700.00 | Window Closed / Lapsed |