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US2774292A
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Earth conditioning device
Assignee: Porter Cable Machine Co
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Filing: 1954-04-28
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Granted: 1956-12-18
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Expires: 1974-04-28
Abstract
No abstract record available.
Inventors
- 👤 Hartmann Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:43
CPC Classifications
A; A01; A01B; A01B33/00; A01B33/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2517733A
Cited
US2441506A
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US2613582A
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US2625867A
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US2697897A
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US2639564A
Cited
US2651246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |