Patent US4496533A successfully refreshed from Google Patents.
US4496533A
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Process for purifying graphite
Assignee: Atlantic Richfield Co
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Filing: 1982-11-03
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Granted: 1985-01-29
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Expires: 2002-11-03
Abstract
Abstract A process for purifying graphite comprising: (1) comminuting graphite containing mineral matter to liberate at least a portion of the graphite particles from the mineral matter; (2) mixing the comminuted graphite particles containing mineral matter with water and hydrocarbon oil to form a fluid slurry; (3) separating a water phase containing mineral matter and a hydrocarbon oil phase containing graphite particles; and (4) separating the graphite particles from the hydrocarbon oil to obtain graphite particles reduced in mineral matter. Depending upon the purity of the graphite desired, steps of the process can be repeated one or more times to provide a progressively purer graphite.
Inventors
- 👤 Richard A. Clausius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:08
CPC Classifications
B; B03; B03B; B03B1/00; B03B5/00; B03B7/00; C; C01; C01B; C01B32/00; C01B32/20; C01B32/21; C01B32/215
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A process for purifying graphite comprising: (1) comminuting graphite containing mineral matter to liberate at least a portion of the graphite particles from the mineral matter; (2) mixing the comminuted graphite particles containing mineral matter with water and hydrocarbon oil having a boiling point of from about 130° F. to 250° F. to form a fluid slurry; (3) separating a water phase containing mineral matter and a hydrocarbon oil phase containing graphite particles; and (4) separating the graphite particles from the hydrocarbon oil to obtain graphite particles reduced in mineral matter.
Claim 2
Dependent Claim
91 words
A process for purifying graphite comprising: (1) comminuting graphite containing mineral matter to liberate at least a portion of the graphite particles from the mineral matter; (2) mixing the comminuted graphite particles containing mineral matter with water and hydrocarbon oil having a boiling point of from about 130° F. to 250° F. to form a fluid slurry; (3) separating a water phase containing mineral matter and a hydrocarbon oil phase containing graphite particles; and (4) separating the graphite particles from the hydrocarbon oil to obtain graphite particles reduced in mineral matter.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the hydrocarbon oil is naphtha.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the fluid slurry comprises about 1 part comminuted graphite-containing mineral matter from about 2 to 10 parts water and from about 2 to 10 parts hydrocarbon oil.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein steps (2), (3) and (4) are repeated one or more times.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein steps (1), (2), (3) and (4) are repeated one or more times.
Claim 7
Dependent Claim
17 words
The process of claim 5 wherein steps (2), (3) and (4) are repeated one or more times.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein the graphite-containing mineral matter is comminuted to a particle size such that it will pass a 9 mesh screen.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein the graphite-containing mineral matter is comminuted to a particle size such that it will pass a 28 mesh screen.
Claim 10
Dependent Claim
33 words
The process of claim 8 wherein the graphite-containing mineral matter is comminuted to a particle size such that it will pass a 28 mesh screen and be retained on a 100 mesh screen.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |