US2956090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of gaseous olefins
Assignee: Ruhrchemie AG
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Filing: 1959-02-04
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Granted: 1960-10-11
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Expires: 1979-02-04
Abstract
No abstract record available.
Inventors
- 👤 Liethen Otto
- 👤 Rottig Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:25
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13; B; B01; B01J; B01J23/00; B01J23/70; C07C7/148; C07C7/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR THE PURIFICATION OF GASES CONSISTING ESSENTIALLY OF OLEFINS HAVING FROM 2 TO 5 CARBON ATOMS AND AN OLEFINIC CONTENT OF AT LEAST 90 PERCENT WHICH COMPRISES PASSING SAID GASES OVER REDUCED CATALYSTS OF THE IRON GROUP AT A TEMPERATURE RANGING FROM 20* TO 100*C., SAID GASES CONTAINING FROM ABOUT 0.25 TO 2 PERCENT OF HYDROGEN, AND SAID CATALYSTS HAVING AN INITIAL REDUCED METAL CONTENT OF LESS THAN 80 PERCENT.
Claim 2
Dependent Claim
72 words
A PROCESS FOR THE PURIFICATION OF GASES CONSISTING ESSENTIALLY OF OLEFINS HAVING FROM 2 TO 5 CARBON ATOMS AND AN OLEFINIC CONTENT OF AT LEAST 90 PERCENT WHICH COMPRISES PASSING SAID GASES OVER REDUCED CATALYSTS OF THE IRON GROUP AT A TEMPERATURE RANGING FROM 20* TO 100*C., SAID GASES CONTAINING FROM ABOUT 0.25 TO 2 PERCENT OF HYDROGEN, AND SAID CATALYSTS HAVING AN INITIAL REDUCED METAL CONTENT OF LESS THAN 80 PERCENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |