Patent US2784508A successfully refreshed from Google Patents.
US2784508A
Expired / Lapsed
US
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Tandem pusher attachment for tractors
Assignee: Caterpillar Inc
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Filing: 1954-07-01
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Granted: 1957-03-12
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Norman E Risk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:52
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1646751A
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US1837108A
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US2404518A
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US2321615A
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US2545739A
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US2677203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |