Patent US3739668A successfully refreshed from Google Patents.
Patent US3177265A successfully refreshed from Google Patents.
US3177265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of paraxylene
Assignee: Standard Oil Co
•
Filing: 1961-06-19
•
Granted: 1965-04-06
•
Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 Gerard C Lammers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:02
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0036; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14; Y; Y10; Y10S; Y10S585/00; Y10S585/909; Y10S585/911
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
70 words
A CONTINUOUS PROCESS FOR MAXIMIZING PRODUCT YIELD IN THE MANUFACTURE OF PARAXYLENE OF 98+% PURITY WHICH PROCESS COMPRISES TWO CRYSTALLIZATION STAGES, THE FIRST OF SAID STAGES COMPRISING AT LEAST TWO REFRIGERATED CONTINUOUS CONFINED CRYSTALLIZATION ZONES, AND IN WHICH CRYSTAL-FREE MOTHER LIQUOR IS SEPARATED DIRECTLY AND CONTINUOUSLY FROM THE COLDEST OF SAID ZONES, SAID CRYSTAL-FREE MOTHER LIQUOR AND 98+% PURITY PARAXYLENE PRODUCT BEING THE ONLY PROCESS STREAMS WITHDRAWN FROM THE PROCESS.
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) | 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 |