US3323869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing expanded graphite
Assignee: Dow Chemical Co
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Filing: 1963-12-19
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Granted: 1967-06-06
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Expires: 1983-12-19
Abstract
No abstract record available.
Inventors
- 👤 Olstowski Franciszek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:36
CPC Classifications
C; C25; C25B; C25B1/00; C01; C01B; C01B32/00; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/536; C25B1/01; C25B1/135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR PREPARING EXPANDED GRAPHIET OF LOW BULK DENSITY WHICH COMPRISES; (A) ANODICALLY ELECTROLYZING A MEMBER SELECTED FROM THE GROUP CONSISTING OF NATURAL CRYSTALLINE FLAKE GRPAHITE AND NATURAL CRYSTALLINE LUMP GRAPHITE IN AN AQUEOUS ELECTROLYTE SOLUTION AT AN ELECTROLYTE TEMPERATURE OF FROM ABOUT 0 TO 80*C., A MINIMUM CELL POTENTIAL OF ABOUT 2 VOLTS AND UTILIZING A QUANTITY OF ELECTRICITY EQUIVALENT TO FROM ABOUT 10 TO ABOUT 500 AMPEREHOURS PER POUND OF GRPAHITE, (B) SEPARATING THE ELECTROLYTICALLY TREATED GRAPHITE FROM THE ELECTROLYTE SOLUTION, AND (C) HEATING SAID ELECTROLYTICALLY TREATED GRAPHITE AT A TEMPERATURE OF FROM ABOUT 150 TO ABOUT 1500*C. THEREBY TO EXPAND SAID GRAPHITE INTO A PRODUCT OF LOW BULK DENSITY.
Claim 2
Dependent Claim
113 words
A PROCESS FOR PREPARING EXPANDED GRAPHIET OF LOW BULK DENSITY WHICH COMPRISES; (A) ANODICALLY ELECTROLYZING A MEMBER SELECTED FROM THE GROUP CONSISTING OF NATURAL CRYSTALLINE FLAKE GRPAHITE AND NATURAL CRYSTALLINE LUMP GRAPHITE IN AN AQUEOUS ELECTROLYTE SOLUTION AT AN ELECTROLYTE TEMPERATURE OF FROM ABOUT 0 TO 80*C., A MINIMUM CELL POTENTIAL OF ABOUT 2 VOLTS AND UTILIZING A QUANTITY OF ELECTRICITY EQUIVALENT TO FROM ABOUT 10 TO ABOUT 500 AMPEREHOURS PER POUND OF GRPAHITE, (B) SEPARATING THE ELECTROLYTICALLY TREATED GRAPHITE FROM THE ELECTROLYTE SOLUTION, AND (C) HEATING SAID ELECTROLYTICALLY TREATED GRAPHITE AT A TEMPERATURE OF FROM ABOUT 150 TO ABOUT 1500*C. THEREBY TO EXPAND SAID GRAPHITE INTO A PRODUCT OF LOW BULK DENSITY.
References Cited (Backward Citations)
US191383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |