US2914383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying graphite
Assignee: Graphitwerk-Kropfmuhl-A G
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Filing: 1952-11-14
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Granted: 1959-11-24
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Expires: 1972-11-14
Abstract
No abstract record available.
Inventors
- 👤 Ulrich Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:32
CPC Classifications
G; G21; G21C; G21C5/00; G21C5/12; G21C5/126; C; C01; C01B; C01B32/00; C01B32/20; C01B32/21; C01B32/215; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
A PROCESS OF PURIFYING GRAPHITE CONTAINING IMPURITIES, COMPRISING THE STEPS OF TREATING SAID GRAPHITE WITH CHLORINE GAS ADAPTED TO REACT WITH AT LEAST ONE OF THE IMPURITIES IN SAID GRAPHITE TO FORM WITH SAID IMPURITIES SUBSTANCES VOLATILE AT A PREDETERMINED TEMPERATURE WHILE MAINTAINING SAID PREDETERMINED TEMPERATURE AND IN THE PRESENCE OF A CATALYST ADAPTED TO PROMOTE SAID REACTION AND BEING SELECTED FRO THE GROUP CONSISTING OF CARBON TETRACHLORIDE AND SODIUM CHLORIDE, THEREBY FREEING SAID IMPURITIES FROM SAID GRAPHITE IN THE FORM OF A GASEOUS COMPOSITION OF THE SAME; AND REMOVING THE THUS FORMED GASEOUS COMPOSITION ALONG WITH EXCESS CHLORINE GAS FROM THE THUS TREATED GRAPHITE, THEREBY OBTAINING SUBSTANTIALLY PURE GRAPHITE.
References Cited (Backward Citations)
US1303362A
Cited
FR957912A
Cited
GB453072A
Cited
US2149671A
Cited
US2315346A
Cited
GB598146A
Cited
US2624698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |