US3436898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas filter
Assignee: Evonik Operations GmbH
•
Filing: 1966-03-15
•
Granted: 1969-04-08
•
Expires: 1986-03-15
Abstract
No abstract record available.
Inventors
- 👤 Franz Kaess
- 👤 Otto Kick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:09
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0039; B01D46/0047; B01D46/0049; B01D46/0002; B01D46/0005; B01D46/24; B01D46/2403; B01D46/2407; B01D2273/00; B01D2273/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2390494A
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US2477623A
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US2526651A
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US2562730A
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US2548400A
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GB724927A
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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) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |