US3770628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating oil containing contaminated drainage
Assignee: Individual
•
Filing: 1972-07-10
•
Granted: 1973-11-06
•
Expires: 1992-07-10
Abstract
Abstract OIL-CONTAINING CONTAMINATED DRAINAGE CAN BE EFFECTIVELY CLARIFIED BY PASSING THE SAME THROUGH A WAX-FILLED BED. IN THE PREFERRED EMBODIMENT THE TREATMENT OF OIL-CONTAINING CONTAMINATED DRAINAGE AS SET FORTH ABOVE IS CARRIED OUT BY THE USE OF COMBINATION PROCESS SELECTED FROM (A) A WAX-FILLED BED-AN ACTIVE CARBON BED PROCESS, (B) A SANDFILTER-A WAX-FILLED BED PROCESS, AND (C) A SANDFILTER-A WAX-FILLED BED-AN ACTIVE CARBON BED PROCESS.
Inventors
- 👤 J Yamamoto
- 👤 K Minakawa
- 👤 H Nishikado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:42
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/04; B01D17/045; B01D17/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |