US1401644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for amplification of small gurrents
Assignee: General Electric Co
•
Filing: 1917-07-31
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Granted: 1921-12-27
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Expires: 1937-07-31
Abstract
No abstract record available.
Inventors
- 👤 Chester W Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:13
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/004
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) | 1924-12-26 | 1925-06-27 | 1925-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-12-26 | 1929-06-27 | 1929-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-12-26 | 1933-06-27 | 1933-12-27 | $7700.00 | Window Closed / Lapsed |