US3817862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating waste waters
Assignee: Fried Krupp AG
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Filing: 1971-10-18
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Granted: 1974-06-18
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Expires: 1991-10-18
Abstract
Abstract A METHOD FOR TREATING WASTE WATERS CONTAINING EMULSIFIED AND DISSOLVED, OXIDIZABLE, ORGANIC SUBSTANCES WHICH ARE FREE OF CYANIDE, NITRITE, HYDRAZINE, DIMETHYL HYDRAZINE, AND NITROGEN TETROXIDE. WASTE WATER IS ADDED TO CARBON OR ION EXCHANGERS SERVING AS A CATALYST AND THE INTERFACIAL AREA BETWEEN THE AIR AND THE RESULTING MIXTURE OF WASTE WATER AND CATALYST IS INCREASED.
Inventors
- 👤 B Hoke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:09
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/725; B; B01; B01J; B01J27/00; B01J27/20; B01J27/22
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |