Patent US3474599A successfully refreshed from Google Patents.
US3474599A
Expired / Lapsed
US
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Filter assemblage for purifying a particle-laden gaseous flow
Assignee: Individual
•
Filing: 1968-01-04
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Granted: 1969-10-28
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Expires: 1988-01-04
Abstract
No abstract record available.
Inventors
- 👤 Louis Schwab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:55
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/522; B01D46/0002; B01D46/0005; B01D46/10
Claims Analysis
Total Claims: 0
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US3389031A
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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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |