Patent US3621639A successfully refreshed from Google Patents.
US3621639A
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Dust filter apparatus utilizing granular solid filter media
Assignee: United States Atomic Energy Commission
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Filing: 1969-11-26
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Granted: 1971-11-23
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Expires: 1989-11-26
Abstract
Abstract APPARATUS FOR FILTERING DUST FROM A STREAM OF GASEOUS MEDIUM USING GRANULAR SILICEOUS FILTER MDIA, WITH PROVISION FOR REGENERATION BY MEANS FOR IMMERSION OF MEDIA IN WATER WITH CONTROLLED GAS FLOW AGITAION, FOLLOWED BY MEANS FOR DRYING WITH HEATED GAS FLOW.
Inventors
- 👤 Edwin F Edwards
- 👤 Jun Fukuzawa
- 👤 Robert L Solnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:30
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |