Patent US2452991A successfully refreshed from Google Patents.
US2452991A
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Liquid clarifying apparatus
Assignee: Gulf Oil Corp
•
Filing: 1945-06-19
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Granted: 1948-11-02
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Expires: 1965-06-19
Abstract
No abstract record available.
Inventors
- 👤 Butcher Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:53
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281; B; B01; B01D; B01D21/00; B01D21/0018; B01D21/0024; B01D21/003; B01D21/0039; B01D21/0042; B01D21/02; B01D21/08; B01D21/24; B01D21/245; B01D21/2466; B01D21/30; B01D21/302; B01D21/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2101081A
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US2128569A
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US2110721A
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US2320512A
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US2317847A
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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) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |