Patent US3525880A successfully refreshed from Google Patents.
US3525880A
Expired / Lapsed
US
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Step-gain signal conditioning circuit
Assignee: Dresser Industries Inc
•
Filing: 1966-10-03
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Granted: 1970-08-25
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Expires: 1986-10-03
Abstract
No abstract record available.
Inventors
- 👤 William F Donnell
- 👤 Herman E Sheffield Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:43
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3005; H03G3/301; H03G3/3015; H03K; H03K5/00; H03K5/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2873387A
Cited
US3159751A
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US3221186A
Cited
US3268658A
Cited
US3246080A
Cited
US3263175A
Cited
US3349386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |