Patent US1128561A successfully refreshed from Google Patents.
Patent US3455588A successfully refreshed from Google Patents.
US3455588A
Expired / Lapsed
US
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Automatic unclogging device for fluid locomotive sanding systems
Assignee: Roanoke College
•
Filing: 1967-04-06
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Granted: 1969-07-15
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Expires: 1987-04-06
Abstract
No abstract record available.
Inventors
- 👤 Virgil L Frantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:08
CPC Classifications
B; B61; B61C; B61C15/00; B61C15/08; B61C15/10; B61C15/102; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2196977A
Cited
US2256289A
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US2291874A
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US2324274A
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US2386006A
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US2589794A
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US2953248A
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US3049141A
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US3103950A
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US3075318A
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US3084484A
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US3359024A
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US3375032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |