Patent US4372895A successfully refreshed from Google Patents.
US4372895A
Expired / Lapsed
US
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Disc for aeration of sewage
Assignee: Siemens Water Technologies Holding Corp
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Filing: 1980-04-28
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Granted: 1983-02-08
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Expires: 2000-04-28
Abstract
Abstract Each face of the disc for sewage aeration includes a multiplicity of recesses. The recesses of one face have no communication with those of the other face and are precisely dimensioned so that the sewage, which is essentially water, flows into and out of each recess without leaving an accumulation of deposits in the recess. This is accomplished with no reduction of and possibly an increase in the aeration efficiency of the disc.
Inventors
- 👤 Edward P. Saffran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:46
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/234; B01F23/2342; C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/14; C02F3/18; B01F27/00; B01F27/60; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/926
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A rotatable disc for aerating and moving liquid such as sewage in a circular channel and having a hub for mounting on a drive shaft and flat parallel faces normal to the hub axis, said disc being of a diameter and constructed for rotation at speeds such that the air is carried as a gas to below the surface of the liquid, each face having a multiplicity of substantially round recesses of generally equal size, the depth of each recess being greater than one-half of and not greater than the diameter of the recess.
Claim 2
Dependent Claim
94 words
A rotatable disc for aerating and moving liquid such as sewage in a circular channel and having a hub for mounting on a drive shaft and flat parallel faces normal to the hub axis, said disc being of a diameter and constructed for rotation at speeds such that the air is carried as a gas to below the surface of the liquid, each face having a multiplicity of substantially round recesses of generally equal size, the depth of each recess being greater than one-half of and not greater than the diameter of the recess.
Claim 3
Dependent Claim
52 words
The disc of claim 1 having a diameter of in the order of five feet (1.52 m) of which approximately the lower two feet (0.61 m) is to be submerged in the liquid and wherein the diameter of each recess is between one-half (12.7 mm) and three-quarters (19.05 mm) of an inch.
Claim 4
Dependent Claim
51 words
The disc of claim 1 wherein the recesses of each face are adjacent to corresponding recesses of the other face such that each two adjacent recesses are separated by an intermediate portion of the disc of nominal thickness measured in the axial direction having reference to the rotation of the disc.
Claim 5
Dependent Claim
20 words
The disc of claim 3 wherein the thickness of each such portion between corresponding recesses is less than their radius.
Claim 6
Dependent Claim
51 words
The disc of claim 2 wherein the recesses of each face are adjacent to corresponding recesses of the other face such that each two adjacent recesses are separated by an intermediate portion of the disc of nominal thickness measured in the axial direction having reference to the rotation of the disc.
Claim 7
Dependent Claim
20 words
The disc of claim 5 wherein the thickness of each such portion between corresponding recesses is less than their radius.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |