Patent US2533232A successfully refreshed from Google Patents.
US2533232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of para xylene
Assignee: California Research LLC
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Filing: 1947-08-29
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Granted: 1950-12-12
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Expires: 1967-08-29
Abstract
No abstract record available.
Inventors
- 👤 Russell G Dressler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:53
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0036; B01D9/004; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS OF RECOVERING PARA XYLENE FROM ORTHO AND META XYLENES IN THE PRESENCE OF FROM AT LEAST 5% BY VOLUME (BASED ON THE ENTIRE HYDROCARBON FRACTION) OF ETHYL BENZENE AND IN THE PRESENCE OF AT LEAST 5% BY VOLUME (BASED ON THE ENTIRE HYDROCARBON FRACTION) OF PARAFFINS BOILING WITHIN THE RANGE OF FROM 230 TO 300*F., WHICH COMPRISES SEPARATING A CRYSTALLIZED PARA XYLENE FRACTION AS A SOLID PHASE FROM LIQUID HYDROCARBONS OF SAID MIXTURE AT A TEMPERATURE BELOW -75*F. BUT ABOVE T2 WHERE
Claim 2
Dependent Claim
84 words
A PROCESS OF RECOVERING PARA XYLENE FROM ORTHO AND META XYLENES IN THE PRESENCE OF FROM AT LEAST 5% BY VOLUME (BASED ON THE ENTIRE HYDROCARBON FRACTION) OF ETHYL BENZENE AND IN THE PRESENCE OF AT LEAST 5% BY VOLUME (BASED ON THE ENTIRE HYDROCARBON FRACTION) OF PARAFFINS BOILING WITHIN THE RANGE OF FROM 230 TO 300*F., WHICH COMPRISES SEPARATING A CRYSTALLIZED PARA XYLENE FRACTION AS A SOLID PHASE FROM LIQUID HYDROCARBONS OF SAID MIXTURE AT A TEMPERATURE BELOW -75*F. BUT ABOVE T2 WHERE
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |