Patent US2835714A successfully refreshed from Google Patents.
US2835714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of organic compounds
Assignee: Shell Development Co
•
Filing: 1950-03-31
•
Granted: 1958-05-20
•
Expires: 1970-03-31
Abstract
No abstract record available.
Inventors
- 👤 Alan C Nixon
- 👤 Jr Carl H Deal
- 👤 Raymond A Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:21
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
THE METHOD OF SEPARATING COMPONENTS FROM A MIXTURE CONSISTING ESSENTIALLY OF C8 AROMATIC HYDROCARBONS CONTAINING PARA-XYLENE AND META-XYLENE, WHICH METHOD COMPRISES (1) FORMING A FIRST ADMIXTURE OF SAID MIXTURE WITH AN AMOUNT OF CARBON TETRABROMIDE SUCH THAT THE COMPOSITION OF THE ADMIXTURE FALLS WITHIN THAT REGION OF A TEMPERATURE-COMPOSITION, LIQUID-SOLID PHASE DIAGRAM OF THE RESULTING SYSTEM IN WHICH A SOLID COMPLEX (A) CONSISTING ONLY OF EQUIMOLAR PROPORTIONS OF CARBON TETRABROMIDE AND A FIRST ONE OF SAID XYLENES IS FIRST PRODUCED ON COOLING; (2) COOLING SAID FIRST ADMIXTURE TO PRODUCE ONLY SAID SOLID COMPLEX (A); (3) SEPARATING SAID SOLID COMPLEX (A) FROM A RESULTING FIRST MOTHER LIQUOR; (4) ALTERING THE PROPORTION OF CARBON TETRABROMIDE IN SAID FIRST MOTHER LIQUOR TO FORM A SECOND ADMIXTURE THE COMPOSITION OF WHICH FALLS WITHIN THAT REGION OF A TEMPERATURE-COMPOSITION, LIQUID-SOLID PHASE DIAGRAM OF THE RESULTING SYSTEM IN WHICH A SECOND SOLID COMPLEX (B) CONSISTING ONLY OF EQUIMOLAR PROPORTIONS OF CARBON TETRABROMIDE AND THE OTHER ONE OF SAID XYLENES IS FIRST PRODUCED ON COOLING; (5) COOLING SAID SECOND ADMIXTURE TO PRODUCE ONLY SAID SECOND SOLID COMPLEX (B); AND (6) SEPARATING SAID SECOND SOLID COMPLEX (B).
Claim 2
Independent Claim
189 words
THE METHOD OF SEPARATING COMPONENTS FROM A MIXTURE CONSISTING ESSENTIALLY OF C8 AROMATIC HYDROCARBONS CONTAINING PARA-XYLENE AND META-XYLENE, WHICH METHOD COMPRISES (1) FORMING A FIRST ADMIXTURE OF SAID MIXTURE WITH AN AMOUNT OF CARBON TETRABROMIDE SUCH THAT THE COMPOSITION OF THE ADMIXTURE FALLS WITHIN THAT REGION OF A TEMPERATURE-COMPOSITION, LIQUID-SOLID PHASE DIAGRAM OF THE RESULTING SYSTEM IN WHICH A SOLID COMPLEX (A) CONSISTING ONLY OF EQUIMOLAR PROPORTIONS OF CARBON TETRABROMIDE AND A FIRST ONE OF SAID XYLENES IS FIRST PRODUCED ON COOLING; (2) COOLING SAID FIRST ADMIXTURE TO PRODUCE ONLY SAID SOLID COMPLEX (A); (3) SEPARATING SAID SOLID COMPLEX (A) FROM A RESULTING FIRST MOTHER LIQUOR; (4) ALTERING THE PROPORTION OF CARBON TETRABROMIDE IN SAID FIRST MOTHER LIQUOR TO FORM A SECOND ADMIXTURE THE COMPOSITION OF WHICH FALLS WITHIN THAT REGION OF A TEMPERATURE-COMPOSITION, LIQUID-SOLID PHASE DIAGRAM OF THE RESULTING SYSTEM IN WHICH A SECOND SOLID COMPLEX (B) CONSISTING ONLY OF EQUIMOLAR PROPORTIONS OF CARBON TETRABROMIDE AND THE OTHER ONE OF SAID XYLENES IS FIRST PRODUCED ON COOLING; (5) COOLING SAID SECOND ADMIXTURE TO PRODUCE ONLY SAID SECOND SOLID COMPLEX (B); AND (6) SEPARATING SAID SECOND SOLID COMPLEX (B).
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) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |