US3682807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining waste oils
Assignee: Individual
•
Filing: 1970-03-03
•
Granted: 1972-08-08
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Expires: 1990-03-03
Abstract
Abstract THE REMOVAL OF SOLID PARTICAL IMPURITIES FROM WASTE OILS IS PERFORMED BY CONVENTIONAL MEANS AFTER THE IMPURITIES HAVE BEEN BROUGHT TOGETHER INTO A MASS TO SUCH AN EXTENT AS TO BE CAPABLE OF FILTERING, THE AGGREGATION BEING EFFECTED BY AN ELECTRIC SPARK TAKING PLACE IN THE WASTE OIL HAVING A DIELECTRIC MEDIUM THEREIN.
Inventors
- 👤 Wataru Ishibashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:11
CPC Classifications
C; C10; C10G; C10G32/00; C10G32/02; B; B01; B01D; B01D21/00; B01D21/0009; B01D35/00; B01D35/06; B03; B03C; B03C5/00; B03C5/02; B03C5/022; B03C5/024; C10M; C10M175/00; C10M175/0066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |