Patent US2815591A successfully refreshed from Google Patents.
US2815591A
Expired / Lapsed
US
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Earth moving device
Assignee: HEATH ENGINEERING Co
•
Filing: 1954-02-26
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Granted: 1957-12-10
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Expires: 1974-02-26
Abstract
No abstract record available.
Inventors
- 👤 John W Mattingly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:22
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7622; E02F3/7627
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US67252A
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US2183058A
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US962264A
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US1265099A
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US1713030A
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US1828711A
Cited
US1956385A
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US2228450A
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US2417595A
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US2564355A
Cited
US2740214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |