Patent US2808920A successfully refreshed from Google Patents.
US2808920A
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US
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Material loading apparatus
Assignee: Joy Manufacturing Co
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Filing: 1951-04-17
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Granted: 1957-10-08
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Expires: 1971-04-17
Abstract
No abstract record available.
Inventors
- 👤 Harold F Silver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:05
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2002952A
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US2078863A
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US2199723A
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US2229648A
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US2315091A
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US2410012A
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US2425695A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |