US2929501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclone separator
Assignee: International Minerals and Chemical Corp
•
Filing: 1957-01-30
•
Granted: 1960-03-22
•
Expires: 1977-01-30
Abstract
No abstract record available.
Inventors
- 👤 Douglas H Fenske
- 👤 Roy T Sorensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:33
CPC Classifications
B; B04; B04C; B04C5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US854516A
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US836922A
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US1159267A
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US1125032A
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FR681652A
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FR40454E
Cited
FI20481A
Cited
US2153026A
Cited
US2252581A
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US2756878A
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US2829771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |