Patent US3869302A successfully refreshed from Google Patents.
US3869302A
Expired / Lapsed
US
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Method for manufacture of graphite flour
Assignee: SGL Carbon Corp
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Filing: 1972-08-01
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Granted: 1975-03-04
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Expires: 1992-08-01
Abstract
Abstract Graphite flour is prepared by forming spheres of a carbonforming pitch or like material; protecting the surface of the spheres by the application and curing of a thermosetting resin thereupon; then carbonizing and graphitizing the surface protected pitch spheres.
Inventors
- 👤 Frederick L Shea
- 👤 Mack P Whittaker
- 👤 Lloyd I Grindstaff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A METHOD FOR THE MANUFACTURE OF GRAPHITE FLOUR WHICH COMPRISES: A. NEBULIZING A GRAPHITIZABLE, CARBON-FORMING PITCH OF COAL OR PETROLEUM ORIGIN INTO SPHERES OF ABOUT 10 TO ABOUT 3000U DIAMETER; B. COATING THE SURFACE OF THE SPHERES WITH A THERMOSETTING RESIN AND SETTING THE RESIN TO PREVENT COALESCENCE THEREOF WHEN HEATING TO ABOVE THEIR MELTING POINT WHILE IN CONTACT THEREBETWEEN; AND C. CARBONIZING AND GRAPHITING THE COATED SPHERES BY HEATING TO ABOUT 880*C.-I,000*C. THEN TO ABOUT 2,500*C.3,000*C. IN AN INERT ATMOSPHERE.
Claim 2
Independent Claim
81 words
A METHOD FOR THE MANUFACTURE OF GRAPHITE FLOUR WHICH COMPRISES: A. NEBULIZING A GRAPHITIZABLE, CARBON-FORMING PITCH OF COAL OR PETROLEUM ORIGIN INTO SPHERES OF ABOUT 10 TO ABOUT 3000U DIAMETER; B. COATING THE SURFACE OF THE SPHERES WITH A THERMOSETTING RESIN AND SETTING THE RESIN TO PREVENT COALESCENCE THEREOF WHEN HEATING TO ABOVE THEIR MELTING POINT WHILE IN CONTACT THEREBETWEEN; AND C. CARBONIZING AND GRAPHITING THE COATED SPHERES BY HEATING TO ABOUT 880*C.-I,000*C. THEN TO ABOUT 2,500*C.3,000*C. IN AN INERT ATMOSPHERE.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein nebulization is accomplished by forcing the hot pitch through a nozzle.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the neubulization is accomplished by dropping the pitch on the peripheral surface of a spinning plate.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein nebulization is accomplished by feeding the pitch onto the face plate of an ultrasonic generator.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the thermosetting resin coating is added during the nebulization step.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the thermosetting resin coating is added after the nebulization step.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein the graphite flour consists of anisotropic spheres.
References Cited (Backward Citations)
US2697028A
Cited
US3392216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |