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US3511375A
Expired / Lapsed
US
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Process and apparatus for hydraulically separating particulate solids according to particle settling rate
Assignee: Wellman-Power Gas Inc
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Filing: 1968-10-02
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Granted: 1970-05-12
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Expires: 1988-10-02
Abstract
No abstract record available.
Inventors
- 👤 Warren H Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:45
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/62; B03B5/623
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191225936A
Cited
US2025412A
Cited
US2418821A
Cited
US2784841A
Cited
US3295677A
Cited
US3351195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |