Patent US956862A successfully refreshed from Google Patents.
US3525199A
Expired / Lapsed
US
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System integrating bag filter shake manifold with casing structural system
Assignee: Research Cottrell Inc
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Filing: 1968-05-08
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Granted: 1970-08-25
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Expires: 1988-05-08
Abstract
No abstract record available.
Inventors
- 👤 Philip B Crommelin Jr
- 👤 Bob R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/70; B01D46/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US941068A
Cited
US1230567A
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US1427120A
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US2656157A
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US2804168A
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US2878529A
Cited
GB795199A
Cited
US2964129A
Cited
US3266225A
Cited
US3377783A
Cited
US3375641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |