Patent US3534903A successfully refreshed from Google Patents.
US3534903A
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Centrifuge apparatus
Assignee: Pennwalt Corp
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Filing: 1967-09-19
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Granted: 1970-10-20
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Expires: 1987-09-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Keith Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:54
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/04; B04B1/08; B01; B01D; B01D21/00; B01D21/26; B01D21/262; B01D21/30; B01D21/34; B04B1/10; B04B1/12; C; C10; C10G; C10G31/00; C10G31/10; C10G73/00; C10G73/02; C10G73/28
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) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |