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US2840303A
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Centrifugal separator
Assignee: Hercules Powder Co
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Filing: 1955-07-06
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Granted: 1958-06-24
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Expires: 1975-07-06
Abstract
No abstract record available.
Inventors
- 👤 Ii Joseph Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:40
CPC Classifications
B; B04; B04B; B04B1/00; C; C06; C06B; C06B21/00; C07; C07C; C07C201/00; C07C201/02
Claims Analysis
Total Claims: 0
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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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |