US3440799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas scrubber
Assignee: Individual
•
Filing: 1968-06-27
•
Granted: 1969-04-29
•
Expires: 1988-06-27
Abstract
No abstract record available.
Inventors
- 👤 Dag Romell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:29
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE300589C
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DE329422C
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US2357355A
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US2357354A
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US2742581A
Cited
US2778443A
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US2881335A
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US2949168A
Cited
US3122660A
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US3193912A
Cited
US3225225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |