Patent US3637490A successfully refreshed from Google Patents.
US3637490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation of solids from waste waters
Assignee: Calgon Corp
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Filing: 1970-07-27
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Granted: 1972-01-25
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Expires: 1990-07-27
Abstract
Abstract In a method for the removal of waste solids from industrial and municipal waste water in flotation apparatus, the improvement comprising; blending into the waste water, prior to flotation, a sufficient amount of flotation agent and flocculant to effect rapid flotation of the waste solids from the waste water, passing the blended mixture thus formed into the flotation apparatus, removing the waste solids from the flotation apparatus as scum, and removing the remaining waste water from the flotation apparatus as effluent. Microballoon agents and flocculant polymers are utilized.
Inventors
- 👤 William H Gardner
- 👤 Norval F Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24; B; B03; B03D; B03D1/00; B03D1/14; B03D1/1431; B03D1/1443; B03D1/1468
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
The method as in claim 1 wherein the flotation agent is added to the waste water prior to addition of the flocculant.
Claim 2
Dependent Claim
13 words
The method as in claim 1 wherein the flocculant comprises water-soluble organic polymer.
Claim 3
Dependent Claim
37 words
The method as in claim 1 wherein the flotation agent is present in an amount from about 10 to about 100 p.p.m. and the flocculant is present in an amount from about 0.1 to about 1 p.p.m.
Claim 4
Dependent Claim
17 words
The method as in claim 4 wherein the flotation agent consists essentially of glass or ceramic microballoons.
Claim 5
Dependent Claim
19 words
The method as in claim 4 wherein the flocculant consists essentially of an anionic or cationic water-soluble organic polymer.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |