Patent US4001589A successfully refreshed from Google Patents.
Patent US3688905A successfully refreshed from Google Patents.
US3688905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification assembly
Assignee: Svenska Interpur AB
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Filing: 1970-04-17
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Granted: 1972-09-05
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Expires: 1990-04-17
Abstract
Abstract A water purifier comprises a helical screw of sheet material carrying biologically active microorganisms. The helix is fitted around a horizontal, rotating shaft, and the outer periphery of the helix is tightly fitted within a cylindrical casing. End walls close off the casing, and a water inlet is provided in one end wall and a water outlet in the other, opposite end wall. Water traveling through the casing must traverse the helix surfaces and thus be subject to purification action, and cannot pass between the outer edges of the helix and the casing.
Inventors
- 👤 Carl Sigvard Nordgard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:20
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/082; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A waste water purification apparatus, comprising: a. a plurality of generally circular, disc-shaped elements carrying biologically active microorganisms on the surfaces thereof and being spaced in close proximity to each other along a horizontal axis, the outer peripheries of the elements lying along a common, cylindrical surface of revolution, and forming a helix, b. a cylindrical casing, open at both ends, surrounding the elements and being rigidly and tightly engaged with the outer peripheries thereof along their entire circumferences, thereby defining a helical purification chamber within the casing, c. first and second end wall units individually and sealingly connected to to the opposite ends of the casing, d. a waste water inlet on the first end wall unit, e. a purified water outlet on the second end wall unit, and f. means for rotating the casing about the horizontal axis, to force waste water to travel through the apparatus and traverse and contact the surfaces of the elements and thereby not pass directly between the outer peripheries of the elements and the casing.
Claim 2
Dependent Claim
173 words
A waste water purification apparatus, comprising: a. a plurality of generally circular, disc-shaped elements carrying biologically active microorganisms on the surfaces thereof and being spaced in close proximity to each other along a horizontal axis, the outer peripheries of the elements lying along a common, cylindrical surface of revolution, and forming a helix, b. a cylindrical casing, open at both ends, surrounding the elements and being rigidly and tightly engaged with the outer peripheries thereof along their entire circumferences, thereby defining a helical purification chamber within the casing, c. first and second end wall units individually and sealingly connected to to the opposite ends of the casing, d. a waste water inlet on the first end wall unit, e. a purified water outlet on the second end wall unit, and f. means for rotating the casing about the horizontal axis, to force waste water to travel through the apparatus and traverse and contact the surfaces of the elements and thereby not pass directly between the outer peripheries of the elements and the casing.
Claim 3
Dependent Claim
32 words
A purification apparatus as claimed in claim 1, wherein the helix (8) is provided with aerating holes (30, 31) in each individual turn to permit circulation of air in an axial direction.
Claim 4
Dependent Claim
37 words
A purification apparatus as claimed in claim 1 further comprising a driven shaft coextensive with the horizontal axis of the helix, and wherein the inner periphery of the helix (8) is rigidly mounted on the shaft (9).
Claim 5
Dependent Claim
58 words
A purification apparatus as claimed in claim 3 wherein the shaft (9) has a longitudinal bore and openings (19) communicating with said bore are formed along the entire longitudinal extension of the shaft between each pair of adjacent turns of the helix, one end of said shaft being connected to a source (34) for the supply of air.
Claim 6
Dependent Claim
54 words
A purification apparatus as claimed in claim 1 further comprising: a. a basin surrounding the apparatus and having a settling chamber in the bottom thereof adjacent the first end wall unit, and b. a screw conveyor externally disposed around the casing for conveying any sludge discharged from the water outlet to the settling chamber.
References Cited (Backward Citations)
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |