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US2459409A
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Method for purifying used oils
Assignee: Alfa Laval Holdings Amsterdam AB
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Filing: 1946-02-04
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Granted: 1949-01-18
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Expires: 1966-02-04
Abstract
No abstract record available.
Inventors
- 👤 Bjornstjerna Curt Roger Magnus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:02
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0025; C10M175/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1359453A
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FR567420A
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US1694478A
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US1836338A
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US1824498A
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US2061666A
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US2286369A
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US2081632A
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US2223999A
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US2320106A
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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) | 1952-01-18 | 1952-07-19 | 1953-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-18 | 1956-07-19 | 1957-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-18 | 1960-07-19 | 1961-01-18 | $7700.00 | Window Closed / Lapsed |