Patent US2966853A successfully refreshed from Google Patents.
US2966853A
Expired / Lapsed
US
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Buoyant mine with gradiometer
Assignee: Individual
•
Filing: 1941-10-27
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Granted: 1961-01-03
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Expires: 1961-10-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward S Gilfillan
- 👤 Seymour J Sindeband
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:25
CPC Classifications
F; F42; F42B; F42B22/00; F42B22/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US542732A
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GB191009581A
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GB112635A
Cited
GB130050A
Cited
GB130350A
Cited
US1907864A
Cited
US1992100A
Cited
US1971549A
Cited
FR803907A
Cited
US2123045A
Cited
US2296754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |