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US3452292A
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Variable gain differential direct current amplifier
Assignee: International Business Machines Corp
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Filing: 1965-02-05
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Granted: 1969-06-24
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Expires: 1985-02-05
Abstract
No abstract record available.
Inventors
- 👤 James J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:41
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0017; H03G1/0023; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/4508; H03F3/45085; H03F3/45479; H03F3/45484; H03F3/45488; H03F3/45493; H03F3/45511; H03F2200/00; H03F2200/153; H03F2203/00; H03F2203/45; H03F2203/45418; H03F2203/45432; H03F2203/45446; H03F2203/45466; H03F2203/45594; H03F2203/45652; H03F2203/45686
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |