US3622083A
Expired / Lapsed
US
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Apparatus and methods for processing ceramic mold and core materials
Assignee: HERBERT GREENEWALD JR
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Filing: 1970-05-18
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Granted: 1971-11-23
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Expires: 1990-05-18
Abstract
Abstract Apparatus for processing ceramic mold and core materials of the type containing ceramic flours, gel binder, and agglomerated gelbound flour particles utilizes a pair of oppositely rotating, closely spaced rolls having generally cylindrical surfaces with high coefficients of friction. The opposed cooperating surfaces of the spaced-apart rolls move in a like direction but with significantly different velocities to finely divide the agglomerated materials.
Inventors
- 👤 Herbert Greenewald Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:42
CPC Classifications
B; B02; B02C; B02C4/00; B02C4/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
32 words
The apparatus defined by claim 1, wherein said pair of parallel rolls are spaced apart a distance in the range of approximately 0.002 inch to 0.040 inch at said opposed surface regions.
Claim 2
Dependent Claim
20 words
The apparatus defined by claim 1, wherein said pair of parallel rolls surface velocity ration is at least approximately 8:1.
Claim 3
Dependent Claim
107 words
The apparatus defined by claim 1, wherein there is additionally included a pair of bearing support assemblies supporting said pair of parallel rolls, each said bearing support assembly being comprised of a pair of bearing means cooperating with said pair of parallel rolls, a pair of opposed rigid bars supporting said bearing means, and a pair of tie bars connecting said pair of opposed rigid bars to each other, said pair of tie bars bars being oriented parallel to and positioned at equal distances from a transverse line intersecting the axes of rotation of said pair of parallel rolls at right angles and at said bearing means.
Claim 4
Dependent Claim
78 words
In a method of processing gel-type ceramic materials having contained agglomerates of flourlike particles and gel into useful forms for making metal casting molds and cores, the step of shearing agglomerated flourlike particles of a gel-type ceramic material between opposed closely spaced-apart surfaces of retained films of said gel-type ceramic material moved relative to each other at a differential velocity based on a velocity ratio greater than approximately 4:1 to thereby form a finely divided gel-type ceramic material.
Claim 5
Dependent Claim
24 words
The method defined by claim 5, wherein said finely divided gel-type ceramic material is additionally press formed into a shape using moderate compression pressures.
Claim 6
Dependent Claim
22 words
The method defined by claim 5, wherein said differential velocity is based on a velocity ratio that is at least approximately 8:1.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |