US3177264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of paraxylene
Assignee: Halcon Research and Development Corp
•
Filing: 1961-03-27
•
Granted: 1965-04-06
•
Expires: 1981-03-27
Abstract
No abstract record available.
Inventors
- 👤 Norbert N Buchsbaum
- 👤 Martin O Sorensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:32
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
IN A PROCESS FOR THE PRODUCTION OF PARAXYLENE WHEREIN THE PARAXYLENE IS CRYSTALLIZED AND SEPARATED FROM A MIXTURE CONTAINING PRREDOMINANTLY C8 AROMATIC HYDROCARBONS; AND WHEREIN THE RESIDUAL LIQUID IS ISOMERIZED TO FORM AN ISOMERIZATE ENRICHED IN PARAXYLENE, THE IMPROVEMENT OF: INITIALLY FRACTIONATING SAID ISOMERIZATE IN A FIRST FRACTIONATION ZONE TO REMOVE MATERIALS HEAVIER THAN C8 AROMATIC HYDROCARBONS AS A BOTTOMS FRACTION; SUBSEQUENTLY INTRODUCING THE DISTILLATE FROM SAID FIRST FRACTIONATION ZONE; AS
Claim 2
Dependent Claim
71 words
IN A PROCESS FOR THE PRODUCTION OF PARAXYLENE WHEREIN THE PARAXYLENE IS CRYSTALLIZED AND SEPARATED FROM A MIXTURE CONTAINING PRREDOMINANTLY C8 AROMATIC HYDROCARBONS; AND WHEREIN THE RESIDUAL LIQUID IS ISOMERIZED TO FORM AN ISOMERIZATE ENRICHED IN PARAXYLENE, THE IMPROVEMENT OF: INITIALLY FRACTIONATING SAID ISOMERIZATE IN A FIRST FRACTIONATION ZONE TO REMOVE MATERIALS HEAVIER THAN C8 AROMATIC HYDROCARBONS AS A BOTTOMS FRACTION; SUBSEQUENTLY INTRODUCING THE DISTILLATE FROM SAID FIRST FRACTIONATION ZONE; AS
References Cited (Backward Citations)
US2837581A
Cited
US2890232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |