Patent US3744774A successfully refreshed from Google Patents.
US3744774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for aerating liquids
Assignee: South African Inventions Development Corp
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Filing: 1971-03-02
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Granted: 1973-07-10
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Expires: 1991-03-02
Abstract
Abstract The present invention provides for a device for aerating liquids such as sewage. The device includes a rotatable disc-like member having protruding formations adapted to draw air into the liquid to be aerated during rotation of the member when partly immersed in the liquid.
Inventors
- 👤 P Huisman
- 👤 C Jelier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:26
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/14; C02F3/18; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/234; B01F23/2342; B01F27/00; B01F27/60; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A gas-liquid contact element comprising a rotatable disc-like member having protruding formations on two faces transverse to its rotational axis adapted to draw air into a liquid during rotation of the member when partly immersed in the liquid, the protruding formations being nodules standing proud of the surface of the disc-like member and each nodule having a convergent shape comprising a plurality of intersecting flat faces and converging in the direction of rotation of the disc-like member from a blunt base to an apex so that during rotation of the disc-like member an air bubble is drawn into the liquid by the blunt base of each nodule during movement of the nodule from the air into the liquid.
Claim 2
Dependent Claim
118 words
A gas-liquid contact element comprising a rotatable disc-like member having protruding formations on two faces transverse to its rotational axis adapted to draw air into a liquid during rotation of the member when partly immersed in the liquid, the protruding formations being nodules standing proud of the surface of the disc-like member and each nodule having a convergent shape comprising a plurality of intersecting flat faces and converging in the direction of rotation of the disc-like member from a blunt base to an apex so that during rotation of the disc-like member an air bubble is drawn into the liquid by the blunt base of each nodule during movement of the nodule from the air into the liquid.
Claim 3
Dependent Claim
50 words
A device according to claim 1, in which the nodules are arranged in circumferential rows concentric with the rotational axis of the disc-like member, the apices of the nodules in any one circumferential row trailing the blunt bases of the nodules in that row during rotation of the disc-like member.
Claim 4
Dependent Claim
38 words
A device according to claim 1, in which the nodules are arranged in radial rows intersecting each other at the rotational axis of the disc-like member, the nodules in adjacent radial rows being circumferentially staggered from each other.
Claim 5
Dependent Claim
49 words
A device according to claim 1, in which in addition to protruding formations there are provided apertures through the disc-like member, the disc-like member being apertured and the protruding formations being provided in the form of inserts mounted in some of the apertures, the remaining apertures being left open.
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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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |