Patent US4132914A successfully refreshed from Google Patents.
Patent US3159657A successfully refreshed from Google Patents.
US3159657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of light-colored sulfonated fatty acids and fatty acid derivatives
Assignee: Henkel AG and Co KGaA
•
Filing: 1962-05-15
•
Granted: 1964-12-01
•
Expires: 1982-05-15
Abstract
No abstract record available.
Inventors
- 👤 Wulff Carl
- 👤 Stein Werner
- 👤 Koch Otto
- 👤 Weiss Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:01
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
PROCESS FOR LIGHTENING THE COLOR OF DARK-COLORED ASULFONATION PRODUCTS OBTAINED BY SULFONATING A MEMBER SELECTED FROM THE GROUP CONSISTING OF SUBSTANTIALLY SATURATED FATTY ACIDS CONTAINING FROM 6 TO 28 CARBON ATOMS, THEIR ESTERS WHICH ARE FREE FROM ALCOHOLIC HYDROXYL GROUPS, THEIR NITRILES, AND MIXTURES THEREOF WITH AN EXCESS OF GASEOUS SULFUR TRIOXIDE WHICH COMPRISES CONTACTING THE DARK-COLORED SULFONATION PRODUCT WITH ABOUT 0.2-6% BY WEIGHT OF HYDROGEN PEROXIDE AT A TEMPERATURE BETWEEN ABOUT 20-100*C. IN THE PRESENCE OF AN ADDED AMOUNT OF WATER SUFFICIENT TO MAINTAIN THE CONCENTRATION OF FREE SO3 CALCULATED WITH RESPECT THERETO BETWEEN 90% BY WEIGHT AND THAT OF A 20% SULFURIC ACID SOLUTION.
Claim 2
Dependent Claim
106 words
PROCESS FOR LIGHTENING THE COLOR OF DARK-COLORED ASULFONATION PRODUCTS OBTAINED BY SULFONATING A MEMBER SELECTED FROM THE GROUP CONSISTING OF SUBSTANTIALLY SATURATED FATTY ACIDS CONTAINING FROM 6 TO 28 CARBON ATOMS, THEIR ESTERS WHICH ARE FREE FROM ALCOHOLIC HYDROXYL GROUPS, THEIR NITRILES, AND MIXTURES THEREOF WITH AN EXCESS OF GASEOUS SULFUR TRIOXIDE WHICH COMPRISES CONTACTING THE DARK-COLORED SULFONATION PRODUCT WITH ABOUT 0.2-6% BY WEIGHT OF HYDROGEN PEROXIDE AT A TEMPERATURE BETWEEN ABOUT 20-100*C. IN THE PRESENCE OF AN ADDED AMOUNT OF WATER SUFFICIENT TO MAINTAIN THE CONCENTRATION OF FREE SO3 CALCULATED WITH RESPECT THERETO BETWEEN 90% BY WEIGHT AND THAT OF A 20% SULFURIC ACID SOLUTION.
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |