US2681121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of suspended materials from gases
Assignee: Research Corp
•
Filing: 1951-06-29
•
Granted: 1954-06-15
•
Expires: 1971-06-29
Abstract
No abstract record available.
Inventors
- 👤 Harry L Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:20
CPC Classifications
B; B01; B01D; B01D50/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1338271A
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US1444627A
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US2055368A
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US2056789A
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US2273194A
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US2368828A
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GB654350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |