US2688045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of paraxylene concentrate
Assignee: Standard Oil Development Co
•
Filing: 1952-05-23
•
Granted: 1954-08-31
•
Expires: 1972-05-23
Abstract
No abstract record available.
Inventors
- 👤 John M Powers
- 👤 Raymond A Speed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:50
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A PROCESS FOR SEPARATING PARAXYLENE FROM A FEED STOCK CONSISTING OF A LIQUID MIXTURE OF HYDR
Claim 2
Dependent Claim
16 words
A PROCESS FOR SEPARATING PARAXYLENE FROM A FEED STOCK CONSISTING OF A LIQUID MIXTURE OF HYDR
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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |