US2490215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting for spiral blading within frustoconical mixing chambers
Assignee: Chain Belt Co
•
Filing: 1946-01-10
•
Granted: 1949-12-06
•
Expires: 1966-01-10
Abstract
No abstract record available.
Inventors
- 👤 Louis G Hilkemeier
- 👤 Elmer G Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:01
CPC Classifications
B; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4268
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1322575A
Cited
US1058803A
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US1475904A
Cited
DE490474C
Cited
US1781823A
Cited
US2088099A
Cited
US2167243A
Cited
US2254639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |