Patent US3934825A successfully refreshed from Google Patents.
US3934825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the wet grinding of materials
Assignee: Omya AG
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Filing: 1973-10-23
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Granted: 1976-01-27
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Expires: 1993-10-23
Abstract
Abstract A process is disclosed for the wet grinding of a material such as chalk comprising the steps of preparing a suspension containing material particles no coarser than 43 microns and grinding the material in suspension using grinding bodies having a density of at least 3.7 g/cc, wherein the weight ratio of the grinding bodies to the material is at least 6:1. Specific types of grinding bodies are also disclosed.
Inventors
- 👤 Pierre Delfosse
- 👤 Alfred Bosshard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:41
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/0056; B02C17/00; B02C17/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
93 words
A process for the wet grinding of a material such as chalk, comprising the steps of: forming a suspension containing particles of said material no coarser than 43 microns; and grinding said suspension of material with grinding bodies having a weight density of at least 3.7 g/cc and consisting of 30 to 70 weight percent of zirconium oxide, 0.1 to 5 weight percent of aluminum oxide and 5.0 to 20 weight percent of silicon dioxide, wherein the weight ratio of said grinding bodies to said material to be ground is at least 6:1.
Claim 2
Dependent Claim
93 words
A process for the wet grinding of a material such as chalk, comprising the steps of: forming a suspension containing particles of said material no coarser than 43 microns; and grinding said suspension of material with grinding bodies having a weight density of at least 3.7 g/cc and consisting of 30 to 70 weight percent of zirconium oxide, 0.1 to 5 weight percent of aluminum oxide and 5.0 to 20 weight percent of silicon dioxide, wherein the weight ratio of said grinding bodies to said material to be ground is at least 6:1.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein a polyacrylate is used as a dispersing agent in said suspension.
Claim 4
Dependent Claim
21 words
A process according to claim 2, wherein said material to be ground forms 40 to 70 weight percent of said suspension.
Claim 5
Dependent Claim
23 words
A process according to claim 3, wherein the volume ratio of said grinding bodies to that of said suspension is at least 1.5:1.
Claim 6
Dependent Claim
17 words
A process according to claim 4, wherein said grinding bodies have diameters between 1 and 2.5 mm.
Claim 7
Dependent Claim
23 words
A process according to claim 2, wherein the volume ratio of said grinding bodies to that of said suspension is at least 1.5:1.
Claim 8
Dependent Claim
17 words
A process according to claim 6, wherein said grinding bodies have diameters between 1 and 2.5 mm.
Claim 9
Dependent Claim
17 words
A process according to claim 2, wherein said grinding bodies have diameters between 1 and 2.5 mm.
Claim 10
Dependent Claim
21 words
A process according to claim 8, wherein said material to be ground forms 40 to 70 weight percent of said suspension.
Claim 11
Dependent Claim
21 words
A process according to claim 1, wherein said material to be ground forms 40 to 70 weight percent of said suspension.
Claim 12
Dependent Claim
23 words
A process according to claim 10, wherein the volume ratio of said grinding bodies to that of said suspension is at least 1.5:1.
Claim 13
Dependent Claim
17 words
A process according to claim 11, wherein said grinding bodies have diameters between 1 and 2.5 mm.
Claim 14
Dependent Claim
17 words
A process according to claim 10, wherein said grinding bodies have diameters between 1 and 2.5 mm.
Claim 15
Dependent Claim
23 words
A process according to claim 1, wherein the volume ratio of said grinding bodies to that of said suspension is at least 1.5:1.
Claim 16
Dependent Claim
17 words
A process according to claim 14, wherein said grinding bodies have diameters between 1 and 2.5 mm.
Claim 17
Dependent Claim
17 words
A process according to claim 1, wherein said grinding bodies have diameters between 1 and 2.5 mm.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |