US4265739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation machines and components thereof
Assignee: Individual
•
Filing: 1980-01-18
•
Granted: 1981-05-05
•
Expires: 2000-01-18
Abstract
Abstract Froth flotation apparatus with mechanical agitation and aeration. Impeliers and diffusers therefor which are more durable and less expensive than the state-of-the-art components.
Inventors
- 👤 Robert W. Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:42
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/05; B01F27/051; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2331; B01F23/2334; B01F23/23342; B01F23/2335; B01F23/23352; B01F27/053; B01F27/80; B01F27/81; B03; B03D; B03D1/00; B03D1/14; B03D1/1493; B03D1/16; B03D1/20; B03D1/22; B03D1/24; B03D1/247; B01F23/23312; B01F23/23353; B03D1/1443; B03D1/1468
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
166 words
A froth flotation machine of the subaeration type which comprises: a tank; an impeller rotatably supported in the bottom of said tank; and means for rotating said impeller; said impeller being fabricated without an internal supporting skeleton component from a non-metallic, abrasion and corrosion resistant, elastomeric material which has the following characteristics: ______________________________________
Minimum tensile strength
2000 psi
Minimum tear strength 125 PLI
Minimum modulus of elasticity
at 100% elongation 400
Maximum percent elongation
600
Minimum durometer (Shore A)
40
Abrasion resistance (maximum
1055, Tabor index, H-18 wheel)
100
Maximum percent resilience
50;
______________________________________ said impeller having a hub which is symmetrical with the axis of rotation of the impeller and has its major dimension extending at right angles to said axis, said impeller further including elongated, rectilinear blades integrated at one end only with said hub and extending from said hub along paths parallel to said axis of rotation, and said blades being located at the periphery of the impeller at equidistantly spaced intervals therearound.
Claim 2
Dependent Claim
166 words
A froth flotation machine of the subaeration type which comprises: a tank; an impeller rotatably supported in the bottom of said tank; and means for rotating said impeller; said impeller being fabricated without an internal supporting skeleton component from a non-metallic, abrasion and corrosion resistant, elastomeric material which has the following characteristics: ______________________________________
Minimum tensile strength
2000 psi
Minimum tear strength 125 PLI
Minimum modulus of elasticity
at 100% elongation 400
Maximum percent elongation
600
Minimum durometer (Shore A)
40
Abrasion resistance (maximum
1055, Tabor index, H-18 wheel)
100
Maximum percent resilience
50;
______________________________________ said impeller having a hub which is symmetrical with the axis of rotation of the impeller and has its major dimension extending at right angles to said axis, said impeller further including elongated, rectilinear blades integrated at one end only with said hub and extending from said hub along paths parallel to said axis of rotation, and said blades being located at the periphery of the impeller at equidistantly spaced intervals therearound.
Claim 3
Dependent Claim
84 words
The froth flotation machine as claimed in claim 1 further comprising a diffuser in assembly with said impeller, said diffuser being fabricated without an internal supporting skeleton component from a non-metallic, abrasion and corrosion resistant, elastomeric material which has the following characteristics: ______________________________________
Minimum tensile strength
2000 psi
Minimum tear strength 125 PLI
Minimum modulus of elasticity
at 100% elongation 400
Maximum percent elongation
600
Minimum durometer (Shore A)
40
Abrasion resistance (maximum
1055, Tabor index, H-18 wheel)
100
Maximum percent resilience
50.
______________________________________
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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |