US2899460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of alkaryl sulfonic acids
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:36
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS OF SEPARATING A PURIDIED OIL SOLUBLE ALKARYL SULFONIC ACID FROM A MIXTURE CONTAINING AS CONTAMINANTS OXIDES OF SULFUR AND HYDRATES OF THE SAME WHICH COMPRISES (A) ADDING TO THE CRUDE SULFONIC ACID ON ORGANIC NITROGEN-CONTAINING COMPOUND HAVING THE STRUCTURE:
Claim 2
Dependent Claim
41 words
A PROCESS OF SEPARATING A PURIDIED OIL SOLUBLE ALKARYL SULFONIC ACID FROM A MIXTURE CONTAINING AS CONTAMINANTS OXIDES OF SULFUR AND HYDRATES OF THE SAME WHICH COMPRISES (A) ADDING TO THE CRUDE SULFONIC ACID ON ORGANIC NITROGEN-CONTAINING COMPOUND HAVING THE STRUCTURE:
References Cited (Backward Citations)
US2271635A
Cited
US2453690A
Cited
US2559439A
Cited
US2760970A
Cited
US2807642A
Cited
US2810745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |