US3067270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of xylene isomers by crystallization and distillation
Assignee: Phillips Petroleum Co
•
Filing: 1958-12-19
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Granted: 1962-12-04
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Expires: 1978-12-19
Abstract
No abstract record available.
Inventors
- 👤 John A Weedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:50
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/005; B01D9/0059; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN THE SEPARATION OF META-XYLEN FORM PARA-XYLENE CONTAINED IN A STREAM COMPRISING THESE XYLENES BY CRYSTALLIZING PARA-XYLENE OUT OF A SOLUTION HAVING A MOL RATIO OF PARA-XYLENE TO META-XYLENE GREATER THAN 13/87 AND THEREBY APPROACHING THE PARA-XYLENE TO META-XYLEN EUTECTIC, THE IMPROVEMENT COMPRISING DISTILLING OF THE MOTHER LIQUOR FROM THE CRYSTALLIZER TO SEPARATE A PARA-XYLENE RICH FRACTION AND A META-XYLENE RICH FRACTION AND RECYCLING THE PARA-XYLENE RICH FRACTION DIRECTLY TO SAID CRYSTALLIZER.
Claim 2
Dependent Claim
72 words
IN THE SEPARATION OF META-XYLEN FORM PARA-XYLENE CONTAINED IN A STREAM COMPRISING THESE XYLENES BY CRYSTALLIZING PARA-XYLENE OUT OF A SOLUTION HAVING A MOL RATIO OF PARA-XYLENE TO META-XYLENE GREATER THAN 13/87 AND THEREBY APPROACHING THE PARA-XYLENE TO META-XYLEN EUTECTIC, THE IMPROVEMENT COMPRISING DISTILLING OF THE MOTHER LIQUOR FROM THE CRYSTALLIZER TO SEPARATE A PARA-XYLENE RICH FRACTION AND A META-XYLENE RICH FRACTION AND RECYCLING THE PARA-XYLENE RICH FRACTION DIRECTLY TO SAID CRYSTALLIZER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |