Patent US3579440A successfully refreshed from Google Patents.
US3579440A
Expired / Lapsed
US
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Sewage treatment system
Assignee: Tesco Chemicals Inc
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Filing: 1969-12-04
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Granted: 1971-05-18
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Expires: 1989-12-04
Abstract
Abstract METHOD AND APPARATUS FOR TREATING HOUSEHOLD WASTE WATER WHERIN RAW SEWAGE IS DECOMPOSED WITH AN AEROBIC PROCESS IN A SEPTIC TANK AND CHLORINE IS ADDED TO THE WASTEWATER AFTER IT IS DISCHARGED FROM THE SEPTIC TANK.
Inventors
- 👤 William E Bradley Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:11
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1242; A; A47; A47L; A47L15/00; A47L15/42; A47L15/44; A47L15/4436; B; B01; B01F; B01F21/00; B01F21/20; B01F21/22; C02F1/00; C02F1/68; C02F1/685; C02F1/688; C02F3/006; C02F1/72; C02F1/76; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10T; Y10T137/00; Y10T137/4891
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |