Patent US4136830A successfully refreshed from Google Patents.
US4136830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ore grinding process containing copolymer grinding aids
Assignee: Dow Chemical Co
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Filing: 1977-11-21
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Granted: 1979-01-30
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Expires: 1997-11-21
Abstract
Abstract A process for grinding coal or ores containing metal values comprising carrying out said grinding in a liquid medium and with a grinding aid comprising copolymers or salts of copolymers of styrene with maleic anhydride, itaconic or citraconic acids dispersible in the liquid medium, said grinding aid being present in an amount effective to provide increased grinding efficiency.
Inventors
- 👤 Willy Manfroy
- 👤 Richard R. Klimpel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:11
CPC Classifications
B; B02; B02C; B02C23/00; B02C23/06
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
59 words
A process for grinding coal or ores containing metal values comprising carrying out said grinding in the presence of a liquid medium and a polyelectrolyte grinding aid comprising copolymers of styrene with maleic anhydride, itaconic acid or citraconic acid, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 2
Dependent Claim
59 words
A process for grinding coal or ores containing metal values comprising carrying out said grinding in the presence of a liquid medium and a polyelectrolyte grinding aid comprising copolymers of styrene with maleic anhydride, itaconic acid or citraconic acid, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the grinding aid is a copolymer of styrene with maleic anhydride.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the grinding aid is a copolymer of styrene with itaconic acid.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the grinding aid is a copolymer of styrene with citraconic acid.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein ores containing metal values are ground.
Claim 7
Dependent Claim
9 words
The process of claim 1 wherein coal is ground.
Claim 8
Dependent Claim
61 words
A process for grinding coal or ores containing metal values comprising carrying out said grinding in the presence of a liquid medium and a polyelectrolyte grinding aid comprising salts of copolymers of styrene with maleic anhydride, itaconic acid or citraconic acid, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 9
Dependent Claim
61 words
A process for grinding coal or ores containing metal values comprising carrying out said grinding in the presence of a liquid medium and a polyelectrolyte grinding aid comprising salts of copolymers of styrene with maleic anhydride, itaconic acid or citraconic acid, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 10
Dependent Claim
20 words
The process of claim 7 wherein the grinding aid is a salt of a copolymer of styrene with maleic anhydride.
Claim 11
Dependent Claim
20 words
The process of claim 7 wherein the grinding aid is a salt of a copolymer of styrene with itaconic acid.
Claim 12
Dependent Claim
20 words
The process of claim 7 wherein the grinding aid is a salt of a copolymer of styrene with citraconic acid.
Claim 13
Dependent Claim
23 words
The process of claim 7 wherein the grinding aid is a water-soluble salt of styrene with maleic anhydride, itaconic acid or citraconic acid.
Claim 14
Dependent Claim
15 words
The process of claim 11 wherein the salt is an alkali metal or ammonium salt.
Claim 15
Dependent Claim
12 words
The process of claim 12 wherein the salt is an alkali metal.
Claim 16
Dependent Claim
12 words
The process of claim 13 wherein the alkali metal salt is sodium.
Claim 17
Dependent Claim
17 words
The process of claim 7 wherein the grinding aid is a sodium salt of styrene maleic anhydride.
Claim 18
Dependent Claim
12 words
The process of claim 7 wherein ores containing metal values are ground.
Claim 19
Dependent Claim
9 words
The process of claim 7 wherein coal is ground.
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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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |