Patent US2921969A successfully refreshed from Google Patents.
US2921969A
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Process and apparatus for crystal recovery employing an automatically controlled centrifuge
Assignee: Phillips Petroleum Co
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Filing: 1955-09-12
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Granted: 1960-01-19
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Expires: 1975-09-12
Abstract
No abstract record available.
Inventors
- 👤 John W Loy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
B; B04; B04B; B04B15/00; B04B15/02; B01; B01D; B01D9/00; B01D9/0004; B01D9/0009; B04B1/00; C; C07; C07C; C07C7/00; C07C7/14; Y; Y10; Y10S; Y10S585/00; Y10S585/919; Y10S585/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE RECOVERY OF PARA-XYLENE FROM A MIXTURE COMPRISING ISOMERIC ALKYL BENZENES AND INCLUDING SAID PARA-XYLENE, WHICH COMPRISES COOLING SAID MIXTURE AND FORMING THEREIN CRYSTALS OF PARA-XYLENE, ADMIXING SAID PARA-XYLENE AND ACCOMPANYING MOTHER LIQUOR WITH SUFFICIENT COLD ETHYL ACETATE TO FORM A FULID SLURRY OF CRYSTALS AND ETHYL ACETATE, CENTRIFUGING THE RESULTING MIXTURE IN AN IMPERFORATE CENTRIFUGING ZONE, ADDING SUFFICENT
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE RECOVERY OF PARA-XYLENE FROM A MIXTURE COMPRISING ISOMERIC ALKYL BENZENES AND INCLUDING SAID PARA-XYLENE, WHICH COMPRISES COOLING SAID MIXTURE AND FORMING THEREIN CRYSTALS OF PARA-XYLENE, ADMIXING SAID PARA-XYLENE AND ACCOMPANYING MOTHER LIQUOR WITH SUFFICIENT COLD ETHYL ACETATE TO FORM A FULID SLURRY OF CRYSTALS AND ETHYL ACETATE, CENTRIFUGING THE RESULTING MIXTURE IN AN IMPERFORATE CENTRIFUGING ZONE, ADDING SUFFICENT
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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) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |