Patent US2520266A successfully refreshed from Google Patents.
US2520266A
Expired / Lapsed
US
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Hydraulic leveling and controlling device
Assignee: Individual
•
Filing: 1945-06-23
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Granted: 1950-08-29
•
Expires: 1965-06-23
Abstract
No abstract record available.
Inventors
- 👤 Christopher N Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:01
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/841
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US539466A
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US1272285A
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US2023765A
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US2204033A
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US2210144A
Cited
US2278081A
Cited
US2284550A
Cited
US2377278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |