Apparatus for cleaning sewage water
Abstract
Abstract Sewage water is fed to a surge tank, and from there, periodically and in predetermined quantities, through a batching valve to a sealed evaporator tank, which is surrounded adjacent its lower end by a condensing chamber. When the level of the liquid in the evaporator drops to a predetermined low limit, sensing means opens the batching valve momentarily to fill the tank, thereby starting a vacuum pump which reduces the pressure in the tank and chamber approximately to the saturated vapor pressure in the tank. A vapor fan then pumps vapor from the tank to the chamber, where the vapor condenses and transfers heat to the remaining sewage water in the tank. Periodically the slurry in the tanks is automatically discharged and incinerated.
Inventors
- 👤 H Heen
Bibliographic Details
Claims Analysis
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |