Patent US2252307A successfully refreshed from Google Patents.
US2252307A
Expired / Lapsed
US
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Dust recovery apparatus for chemical and waste heat recovery installations
Assignee: Combustion Engineering Inc
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Filing: 1939-06-15
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Granted: 1941-08-12
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Expires: 1959-06-15
Abstract
No abstract record available.
Inventors
- 👤 Rosencrants Fay Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:06
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06; D21C11/063; D21C11/066; Y; Y02; Y02P; Y02P70/00; Y02P70/10
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) | 1944-08-11 | 1945-02-10 | 1945-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-11 | 1949-02-10 | 1949-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-11 | 1953-02-10 | 1953-08-12 | $7700.00 | Window Closed / Lapsed |