Patent US4126276A successfully refreshed from Google Patents.
US4126276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for grinding coal or ores in a liquid medium
Assignee: Dow Chemical Co
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Filing: 1977-11-21
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Granted: 1978-11-21
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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 polyelectrolyte grinding aid comprising N-(sulfoalkyl)-derivatives of acrylamide and methacrylamide, said grinding aid being dispersible in the liquid medium, and 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
2026-11-07 20:12
CPC Classifications
B; B02; B02C; B02C23/00; B02C23/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
66 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 poly N-(sulfoalkyl)acrylamide or poly N-(sulfoalkyl)methacrylamide, copolymers of the same with each other or with other ethylenically unsaturated monomers, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 2
Dependent Claim
66 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 poly N-(sulfoalkyl)acrylamide or poly N-(sulfoalkyl)methacrylamide, copolymers of the same with each other or with other ethylenically unsaturated monomers, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the grinding aid is a homopolymer of N-(sulfoalkyl)acrylamide.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the grinding aid is a homopolymer of N-(sulfoalkyl)methacrylamide.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the grinding aid comprises a copolymer of N-(sulfoalkyl)acrylamide with an ethylenically unsaturated monomer.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the grinding aid comprises a copolymer of N-(sulfoalkyl)methacrylamide with an ethylenically unsaturated monomer.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein ores containing metal values are ground.
Claim 8
Dependent Claim
9 words
The process of claim 1 wherein coal is ground.
Claim 9
Dependent Claim
69 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 a salt of poly N-(sulfoalkyl)acrylamide or poly N-(sulfoalkyl)methacrylamide, copolymers of the same with each other or with other ethylenically unsaturated monomers, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 10
Dependent Claim
69 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 a salt of poly N-(sulfoalkyl)acrylamide or poly N-(sulfoalkyl)methacrylamide, copolymers of the same with each other or with other ethylenically unsaturated monomers, said grinding aid being dispersible in said medium, and being employed in an amount effective to provide increased grinding efficiency.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein the grinding aid is a homopolymer of N-(sulfoalkyl)acrylamide.
Claim 12
Dependent Claim
14 words
The process of claim 8 wherein the grinding aid is a homopolymer of N-(sulfoalkyl)methacrylamide.
Claim 13
Dependent Claim
19 words
The process of claim 8 wherein the grinding aid comprises a copolymer of N-(sulfoalkyl)acrylamide with an ethylenically unsaturated monomer.
Claim 14
Dependent Claim
19 words
The process of claim 8 wherein the grinding aid comprises a copolymer of N-(sulfoalkyl)methacrylamide with an ethylenically unsaturated monomer.
Claim 15
Dependent Claim
15 words
The process of claim 8 wherein the salt is an alkali metal or ammonium salt.
Claim 16
Dependent Claim
12 words
The process of claim 13 wherein the salt is an alkali metal.
Claim 17
Dependent Claim
12 words
The process of claim 14 wherein the alkali metal salt is sodium.
Claim 18
Dependent Claim
12 words
The process of claim 8 wherein the grinding aid is sodium N-(sulfomethyl)acrylamide.
Claim 19
Dependent Claim
9 words
The process of claim 8 wherein coal is ground.
Claim 20
Dependent Claim
12 words
The process of claim 8 wherein ores containing metal values are 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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |