Patent US3863904A successfully refreshed from Google Patents.
US3863904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixing of fragile granular materials
Assignee: Design Link
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Filing: 1973-01-05
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Granted: 1975-02-04
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Expires: 1993-01-05
Abstract
Abstract Two or more materials, at least one of which is of a granular nature and has a bulk density of less than 70 lb per cubic foot are mixed together by supplying the materials onto a dish-shaped circular surface which is free of projections, closely surrounding the edge of the circular surface with a wall which extends upwards from the surface and rotating the surface with the materials upon it and thus flinging the materials outwards centrifugally and causing them, but the dished shape of the surface, to be deflected upwards over the face of the wall which slows down the rotation applied to the materials by the rotating surface and directs the materials inwards again towards the centre of the surface whence they are again flung centrifugally outwards so that the materials form a toroidally shaped mass around the edge of the surface and the materials circulate around the toroid following a helical path.
Inventors
- 👤 Rudolf Ferdinand Leon Milik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:13
CPC Classifications
B; B27; B27N; B27N1/00; B27N1/02; B01; B01F; B01F27/00; B01F27/80; B01F27/808; B01F27/93; B01F29/00; B01F29/80; B01F29/82; B01F27/05; B01F27/11; B01F27/115; B01F27/1154
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
207 words
A method of mixing together at least two materials, at least one of which is in the form of fragile granules having a bulk density of less than about 70 lb per cubic foot, said method comprising the steps of supplying said materials to a circular dish-shaped surface, having an inclined peripheral portion which is substantially free of projections and has its edge surrounded by a wall surface extending directly substantially vertically upwardly at an obtuse but sharply defined angle to said peripheral portion, holding said wall surface stationary while rotating said dish-shaped surface about a vertical central axis at a peripheral speed of from about 400 to about 2500 feet per minute and for a period of from the order of 5 to the order of 7 seconds and thereby imparting a rotation to said materials and flinging said materials centrifugally outwards and upwards against said stationary wall surface, contact with said wall surface retarding said rotation of said materials and directing said materials inwards towards said axis whence they fall downwards again onto said dish-shaped surface, whereby said materials form a toroidally shaped mass around said peripheral portion of said dish-shaped surface and said materiaLs circulate along a helical path around said toroidally shaped mass.
Claim 2
Independent Claim
207 words
A method of mixing together at least two materials, at least one of which is in the form of fragile granules having a bulk density of less than about 70 lb per cubic foot, said method comprising the steps of supplying said materials to a circular dish-shaped surface, having an inclined peripheral portion which is substantially free of projections and has its edge surrounded by a wall surface extending directly substantially vertically upwardly at an obtuse but sharply defined angle to said peripheral portion, holding said wall surface stationary while rotating said dish-shaped surface about a vertical central axis at a peripheral speed of from about 400 to about 2500 feet per minute and for a period of from the order of 5 to the order of 7 seconds and thereby imparting a rotation to said materials and flinging said materials centrifugally outwards and upwards against said stationary wall surface, contact with said wall surface retarding said rotation of said materials and directing said materials inwards towards said axis whence they fall downwards again onto said dish-shaped surface, whereby said materials form a toroidally shaped mass around said peripheral portion of said dish-shaped surface and said materiaLs circulate along a helical path around said toroidally shaped mass.
Claim 3
Dependent Claim
13 words
A method as claimed in claim 1, wherein said granular material is Perlite.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 2, in which said materials include, in addition to said Perlite, sodium silicate in the form of a viscous liquid.
Claim 5
Dependent Claim
14 words
A method as claimed in claim 1, in which said granular material is Vermiculite.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |