US2820109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic amplifier
Assignee: C G S LABORATORIES Inc
•
Filing: 1952-03-22
•
Granted: 1958-01-14
•
Expires: 1972-03-22
Abstract
No abstract record available.
Inventors
- 👤 Gerhard H Dewitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:17
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2057640A
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US1794932A
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US2200263A
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GB481255A
Cited
US2191315A
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US2435547A
Cited
US2607860A
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US2503039A
Cited
US2585532A
Cited
US2657281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |