US2812389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic amplifier
Assignee: C G S LABORATORIES Inc
•
Filing: 1952-04-19
•
Granted: 1957-11-05
•
Expires: 1972-04-19
Abstract
No abstract record available.
Inventors
- 👤 Gerhard H Dewitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:59
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1544381A
Cited
US1810539A
Cited
US1730254A
Cited
US2075380A
Cited
US2108642A
Cited
GB481255A
Cited
US2197123A
Cited
US2500953A
Cited
US2571915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |