Patent US3785490A successfully refreshed from Google Patents.
US3785490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water purification apparatus
Assignee: DORWIN W TEAGUE ASS Inc
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Filing: 1972-01-03
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Granted: 1974-01-15
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Expires: 1992-01-03
Abstract
Abstract In a froth flotation type of water purification system, a pump is used to deliver influent from a storage reservoir into a froth flotation tank. The pump is subject to intermittent air-binding thereby introducing air into the influent prior to its delivery to the froth flotation tank. The intermittent air-binding of the pump provides for thorough mixing of fine air bubbles with the influent thereby forming an effective froth for removal of suspended solids from the influent.
Inventors
- 👤 J Ryan
- 👤 S Gollin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:35
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24; B; B03; B03D; B03D1/00; B03D1/02; B03D1/028; B03D1/14; B03D1/16; B03D1/22; B03D1/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A froth flotation apparatus for removing suspended solids contained in a liquid, comprising: A tank containing said liquid; A reservoir for receiving said liquid; means including valve means for supplying said liquid to said reservoir from the tank when the liquid in said reservoir is below a predetermined level; A centrifugal pump having an inlet extending into said reservoir and terminating at said predetermined level, said pump also having an outlet; and a froth flotation tank connected to the pump outlet for receiving the said liquid, whereby the pump empties the reservoir to the predetermined level at which level the pump air-binds drawing air into the pump housing and the valve means is actuated to supply additional liquid to the reservoir causing the pump to unbind and mix the air with the liquid.
Claim 2
Dependent Claim
133 words
A froth flotation apparatus for removing suspended solids contained in a liquid, comprising: A tank containing said liquid; A reservoir for receiving said liquid; means including valve means for supplying said liquid to said reservoir from the tank when the liquid in said reservoir is below a predetermined level; A centrifugal pump having an inlet extending into said reservoir and terminating at said predetermined level, said pump also having an outlet; and a froth flotation tank connected to the pump outlet for receiving the said liquid, whereby the pump empties the reservoir to the predetermined level at which level the pump air-binds drawing air into the pump housing and the valve means is actuated to supply additional liquid to the reservoir causing the pump to unbind and mix the air with the liquid.
Claim 3
Dependent Claim
25 words
An apparatus as described in claim 1, additionally comprising means for removing froth collected at the surface of the liquid in the froth flotation tank.
Claim 4
Dependent Claim
22 words
An apparatus as described in claim 1, additionally comprising means for maintaining a substantially constant liquid level within the froth flotation tank.
Claim 5
Dependent Claim
21 words
An apparatus as described in claim 1, additionally comprising means for injecting frothing agents into the liquid passing through said pump.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |