US3346678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing carbon articles
Assignee: Individual
•
Filing: 1963-09-30
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Granted: 1967-10-10
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Harold A Ohlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C01; C01B; C01B32/00; C01B32/90; C01B32/907; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/10; C01P2006/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
THE PROCESS FOR MANUFACTURING A MOLDED CARBON ARTICLE COMPRSING THE STEPS OF: (A) PREPARING A CARBON POWDER HAVING PARTICLES VARYING IN SIZE; (B) PREPARING A BINDER CONSISTING OF FROM 60%-80% PHENOL FORMALDEHYDE AND 20%-40% PHENOL DIALCOHOL; (C) INTIMATELY MIXING SAID POWDER AND BINDER IN A PROPORTION OF 70%-90% BY WEIGHT POWDER AND 10%-30% BY WEIGHT BINDER SO AS TO COAT SAID PARTICLES WITH SAID BINDER; (D) MOLDING SAID COATED POWDER UNDER A PRESSURE IN THE 800-10,000 P.S.I. RANGE AT AN INITIAL TEMPERATURE OF 175*-225*F; (E) EVACUATING GASES AND REACTION PRODUCTS FROM SAID COATED POWDER DURING MOLDING; (F) GRADUALLY INCREASING THE MOLDING TEMPERATURE 5*10*F. PER MINUTE UNTIL A FINAL TEMPERATURE OF 300*600*F. IS REACHED; (G) POST CURING THE MOLDED ARTICLE AT SUBSTANTIALLY ATMOSPHERIC PRESSURES AT A TEMPERATURE IN THE 300*600*F. RANGE FOR A PERIOD OF ONE-FOUR HOURS; AND (H) FURTHER HEATING SAID ARTICLE ABOVE SAID CURING TEMPERATURE AT A TEMPERATURE SUFFICIENT T FULLY CARBONIZE OR GRAPHITIZE THE ARTICLE CONTENTS.
Claim 2
Dependent Claim
158 words
THE PROCESS FOR MANUFACTURING A MOLDED CARBON ARTICLE COMPRSING THE STEPS OF: (A) PREPARING A CARBON POWDER HAVING PARTICLES VARYING IN SIZE; (B) PREPARING A BINDER CONSISTING OF FROM 60%-80% PHENOL FORMALDEHYDE AND 20%-40% PHENOL DIALCOHOL; (C) INTIMATELY MIXING SAID POWDER AND BINDER IN A PROPORTION OF 70%-90% BY WEIGHT POWDER AND 10%-30% BY WEIGHT BINDER SO AS TO COAT SAID PARTICLES WITH SAID BINDER; (D) MOLDING SAID COATED POWDER UNDER A PRESSURE IN THE 800-10,000 P.S.I. RANGE AT AN INITIAL TEMPERATURE OF 175*-225*F; (E) EVACUATING GASES AND REACTION PRODUCTS FROM SAID COATED POWDER DURING MOLDING; (F) GRADUALLY INCREASING THE MOLDING TEMPERATURE 5*10*F. PER MINUTE UNTIL A FINAL TEMPERATURE OF 300*600*F. IS REACHED; (G) POST CURING THE MOLDED ARTICLE AT SUBSTANTIALLY ATMOSPHERIC PRESSURES AT A TEMPERATURE IN THE 300*600*F. RANGE FOR A PERIOD OF ONE-FOUR HOURS; AND (H) FURTHER HEATING SAID ARTICLE ABOVE SAID CURING TEMPERATURE AT A TEMPERATURE SUFFICIENT T FULLY CARBONIZE OR GRAPHITIZE THE ARTICLE CONTENTS.
Claim 3
Dependent Claim
104 words
IN A PROCESS FOR PREPARING A MOLDED POWDER ARTICLE; THE STEPS COMPRISING: (A) PROVIDING A BLENDED MIXTURE OF FINEL GROUND POWDER CONSISTING ESSENTIALLY OF ABOUT 90% SILICON OF 10% ZIRCONIUM; (B) MIXING CARBON PARTICLES WITH SAID SILICON AND ZIRCONIUM MIXTURE; (C) HEATING SAID MIXTURE FROM ABOUT 400*C. TO 2200* (C). IN THE PRESENCE OF VAPORIZED SICL4 AND ZRCL4 AND HYDROGEN GAS TO OBTAIN GRAPHITE PARTICLES PROVIDED WITH A FILM OF SILICON CARBIDE-ZIRCONIUM CARBIDE BINARY; (D) COOLING SAID POWDER TO ROOM TEMPERATURE; (E) MIXING SAID POWDER WITH A RESIN BINDER; AND (F) VACUUM MOLDING SAID POWDER AND BINDER UNDER PRESSURE AND AT A PREDETERMINED TEMPERATURES.
Claim 4
Dependent Claim
104 words
IN A PROCESS FOR PREPARING A MOLDED POWDER ARTICLE; THE STEPS COMPRISING: (A) PROVIDING A BLENDED MIXTURE OF FINEL GROUND POWDER CONSISTING ESSENTIALLY OF ABOUT 90% SILICON OF 10% ZIRCONIUM; (B) MIXING CARBON PARTICLES WITH SAID SILICON AND ZIRCONIUM MIXTURE; (C) HEATING SAID MIXTURE FROM ABOUT 400*C. TO 2200* (C). IN THE PRESENCE OF VAPORIZED SICL4 AND ZRCL4 AND HYDROGEN GAS TO OBTAIN GRAPHITE PARTICLES PROVIDED WITH A FILM OF SILICON CARBIDE-ZIRCONIUM CARBIDE BINARY; (D) COOLING SAID POWDER TO ROOM TEMPERATURE; (E) MIXING SAID POWDER WITH A RESIN BINDER; AND (F) VACUUM MOLDING SAID POWDER AND BINDER UNDER PRESSURE AND AT A PREDETERMINED TEMPERATURES.
References Cited (Backward Citations)
US1804052A
Cited
US2563285A
Cited
US2589582A
Cited
US3197527A
Cited
GB913233A
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US3246056A
Cited
US3244648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |