US2431746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bowl mill with vane means providing uniform velocity upwardly swirling air currents
Assignee: Combustion Engineering Inc
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Filing: 1944-08-25
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Granted: 1947-12-02
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Expires: 1964-08-25
Abstract
No abstract record available.
Inventors
- 👤 Gustav H Frangquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:01
CPC Classifications
B; B02; B02C; B02C15/00; B02C15/04; F; F23; F23K; F23K1/00; B02C2015/002; F23K2201/00; F23K2201/10; F23K2201/1006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |