Patent US3441867A successfully refreshed from Google Patents.
US3441867A
Expired / Lapsed
US
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Master automatic gain control of seismic amplifiers
Assignee: Dresser Systems Inc
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Filing: 1967-06-30
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Granted: 1969-04-29
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Expires: 1987-06-30
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Davison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:03
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/24; G01V1/245; H; H03; H03G; H03G3/00; H03G3/20; H03G3/30
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) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |