Patent US2698592A successfully refreshed from Google Patents.
US2698592A
Expired / Lapsed
US
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Sea anchor
Assignee: Individual
•
Filing: 1953-02-26
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Granted: 1955-01-04
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Expires: 1973-02-26
Abstract
No abstract record available.
Inventors
- 👤 Alvah C Landwehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:14
CPC Classifications
B; B63; B63B; B63B21/00; B63B21/24; B63B21/48
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) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |