US1596558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for amplifying electric currents
Assignee: Individual
•
Filing: 1922-09-29
•
Granted: 1926-08-17
•
Expires: 1942-09-29
Abstract
No abstract record available.
Inventors
- 👤 Boris N Sokoloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:47
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1929-08-16 | 1930-02-15 | 1930-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-08-16 | 1934-02-15 | 1934-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-08-16 | 1938-02-15 | 1938-08-17 | $7700.00 | Window Closed / Lapsed |