US4218318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for treating and purifying waste water
Assignee: Individual
•
Filing: 1979-05-04
•
Granted: 1980-08-19
•
Expires: 1999-05-04
Abstract
Abstract Waste water can be advantageously purified, removing environmental pollution such as offensive odor and pathogens, by making the best use of processes in which in a continuous way the fluid fluctuates repeatedly in fluid-gas flow in a tank, in addition to maximum utilization of activities of useful soil organisms.
Inventors
- 👤 Tadashi Niimi
- 👤 Masanori Niimi
- 👤 Tsutomu Arimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:20
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/32; C02F3/327; C02F3/02; C02F3/04; C02F3/046; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
An apparatus for treating and purifying waste water, which comprises a long and shallow waste water treatment tank having an opening at the upper end thereof and being filled with sand gravel covered with a convex net covered with aerated soil, said tank being positioned dozens of centimeters below the soil surface, and being provided with: (1) an inlet for waste water, (2) a conduit in the base of said tank connected to said inlet, (3) perforated plates overlaying said conduit and supporting said sand gravel filling said tank, (4) a perforated pipe for supplying air arranged under the perforated plates, and (5) an outlet for treated waste water at the surface of the sand gravel covered with said convex net.
Claim 2
Independent Claim
121 words
An apparatus for treating and purifying waste water, which comprises a long and shallow waste water treatment tank having an opening at the upper end thereof and being filled with sand gravel covered with a convex net covered with aerated soil, said tank being positioned dozens of centimeters below the soil surface, and being provided with: (1) an inlet for waste water, (2) a conduit in the base of said tank connected to said inlet, (3) perforated plates overlaying said conduit and supporting said sand gravel filling said tank, (4) a perforated pipe for supplying air arranged under the perforated plates, and (5) an outlet for treated waste water at the surface of the sand gravel covered with said convex net.
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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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |