US3011647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal separator
Assignee: Dorr Oliver Inc
•
Filing: 1957-09-30
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Granted: 1961-12-05
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Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 James C Elsken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:22
CPC Classifications
B; B04; B04B; B04B3/00; B01; B01D; B01D11/00; B01D11/04; B01D11/0476; B01D11/048; B01D21/00; B01D21/0012; B01D21/0039; B01D21/0045; B01D21/26; B01D21/262; B04B1/00; B04B3/04; B04B1/20; B04B2001/2066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US535720A
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US1991490A
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US2511585A
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US2500100A
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US2594445A
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US2553936A
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US2657803A
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US2724549A
Cited
US2685369A
Cited
US2768748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |