US2512253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal separator
Assignee: WR Grace and Co
•
Filing: 1947-04-10
•
Granted: 1950-06-20
•
Expires: 1967-04-10
Abstract
No abstract record available.
Inventors
- 👤 Gaston J Lipscomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/26; B01D21/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1525249A
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US1866663A
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US1845567A
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US1931193A
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US2044915A
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US2192214A
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US2364405A
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US2346005A
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US2377721A
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US2425110A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |