Patent US4861349A successfully refreshed from Google Patents.
US4861349A
Expired / Lapsed
US
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Grinding method
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1988-06-06
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Granted: 1989-08-29
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Expires: 2008-06-06
Abstract
Abstract Solid material is ground in a grinding mill and caking of the ground particles is substantially eliminated by including particulate water absorbent polymeric material in the mill.
Inventors
- 👤 Eugene P. Bublik
- 👤 Zbigniew Sartowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:16
CPC Classifications
B; B02; B02C; B02C23/00; B02C23/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
45 words
In a process comprising a grinding step for grinding a friable particulate, solid material to form ground particles, the improvement wherein water absorbent polymeric material that remains non-sticky throughout the process is included in said grinding step to substantially prevent the ground particles from caking.
Claim 2
Dependent Claim
45 words
In a process comprising a grinding step for grinding a friable particulate, solid material to form ground particles, the improvement wherein water absorbent polymeric material that remains non-sticky throughout the process is included in said grinding step to substantially prevent the ground particles from caking.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein said friable solid material has a free water content below 30%.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein said friable solid material has a free water content of 10 to 25%.
Claim 5
Dependent Claim
32 words
A process according to claim 1 wherein at least 90% by weight of said particulate water absorbent polymeric material is in the form of particles having a dry size below 50 μm.
Claim 6
Dependent Claim
37 words
A process according to claim 4 wherein said polymeric material is added to the mill or to the friable solid material while in the form of a dispersion of particulate polymeric material in a water immiscible liquid.
Claim 7
Dependent Claim
26 words
A process according to claim 1 wherein the polymeric material is a cross linked polymer formed from a water soluble ethylenically unsaturated monomer or monomer blend.
Claim 8
Dependent Claim
36 words
A process according to claim 6 in which said cross linked polymer is formed from 5 to 100 mole percent acrylic acid as free acid or water soluble salt and 0 to 95 mole percent acrylamide.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein said grinding step comprises ball milling.
Claim 10
Dependent Claim
26 words
A process according to claim 4 wherein the polymeric material is a cross linked polymer formed from a water soluble ethylenically unsaturated monomer or monomer blend.
Claim 11
Dependent Claim
36 words
A process according to claim 9 in which said cross linked polymer is formed from 5 to 100 mole percent acrylic acid as free acid or water soluble salt and 0 to 95 mole percent acrylamide.
Claim 12
Dependent Claim
18 words
A process according to claim 4 wherein said friable solid material has a free water content below 30%.
Claim 13
Dependent Claim
20 words
A process according to claim 4 wherein said friable solid material has a free water content of 10 to 25%.
References Cited (Backward Citations)
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Cited
US4761163A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |