Patent US2880235A successfully refreshed from Google Patents.
US2880235A
Expired / Lapsed
US
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Color stabilization of alkylarenesulfonic acids
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-09-23
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Granted: 1959-03-31
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Expires: 1977-09-23
Abstract
No abstract record available.
Inventors
- 👤 Leo J Weaver
- 👤 Jr Edwin J Eccles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:08
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR PRODUCING A CLEAR COLOR-STABILIZED ALKYLARENESULFONIC ACID CONTAINING FROM ABOUT 9 TO ABOUT 22 CARBON ATOMS IN THE ALKYL GROUPS THEREOF, SAID STABILIZED ALKYLARENESULFONIC ACID BEING PREPARED FROM A CRUDE ALKYLARENESULFONIC ACID HAVING DISPERSED THEREIN AN APPRECIABLE PROPORTION OF SULFURIC ACID, WHICH PROCESS COMPRISES TREATING SAID CRUDE SULFONIC ACID WITH (1) HYDROGEN PEROXIDE IN A MINOR AMOUNT UP TO ABOUT 3 WT. PERCENT AND (2) AN ALKALINE NEUTRALIZING AGENT IN A MINOR AMOUNT STOICHIOMETRICALLY SUFFICIENT TO CONVERT A PREDOMINANT PROPORTION OF THE SULFURIC ACID TO BISSULFATE SALT WITHOUT NEUTRALIZING A SUBSTANTIAL PROPORTION OF THE SULFONIC ACID.
Claim 2
Dependent Claim
98 words
A PROCESS FOR PRODUCING A CLEAR COLOR-STABILIZED ALKYLARENESULFONIC ACID CONTAINING FROM ABOUT 9 TO ABOUT 22 CARBON ATOMS IN THE ALKYL GROUPS THEREOF, SAID STABILIZED ALKYLARENESULFONIC ACID BEING PREPARED FROM A CRUDE ALKYLARENESULFONIC ACID HAVING DISPERSED THEREIN AN APPRECIABLE PROPORTION OF SULFURIC ACID, WHICH PROCESS COMPRISES TREATING SAID CRUDE SULFONIC ACID WITH (1) HYDROGEN PEROXIDE IN A MINOR AMOUNT UP TO ABOUT 3 WT. PERCENT AND (2) AN ALKALINE NEUTRALIZING AGENT IN A MINOR AMOUNT STOICHIOMETRICALLY SUFFICIENT TO CONVERT A PREDOMINANT PROPORTION OF THE SULFURIC ACID TO BISSULFATE SALT WITHOUT NEUTRALIZING A SUBSTANTIAL PROPORTION OF THE SULFONIC ACID.
References Cited (Backward Citations)
US2806055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |