US2821549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of nuclear sulfonated vinyl aromatic compounds
Assignee: Dow Chemical Co
•
Filing: 1954-01-27
•
Granted: 1958-01-28
•
Expires: 1974-01-27
Abstract
No abstract record available.
Inventors
- 👤 Richard A Mock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:55
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/39; C07C303/00; C07C303/02; C07C303/04; C07C303/06; C07C303/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
25 words
A BETA-HALOETHYL-AROMATIC SULFONIC ACID OF THE BENZENE SERIES WHEREIN THE HALOGEN ATOM OF THE BETAHALOETHYL RADICAL IS OF THE GROUP CONSISTING OF CHLORINE AND BROMINE.
Claim 2
Dependent Claim
25 words
A BETA-HALOETHYL-AROMATIC SULFONIC ACID OF THE BENZENE SERIES WHEREIN THE HALOGEN ATOM OF THE BETAHALOETHYL RADICAL IS OF THE GROUP CONSISTING OF CHLORINE AND BROMINE.
Claim 3
Independent Claim
144 words
A METHOD OF MAKING A SALT OF A VINYL AROMATIC SULFONIC ACID WHICH COMPRISES SULFONATING A BETA-HALOETHYL AROMATIC COMPOUND BY MIXING APPROXIMATELY ITS MOLECULAR EQUIVALENT OF SULFUR TRIOXIDE THEREWITH AT A REACTION TEMPERATURE BELOW 80*C., EXTRACTING THE RESULTING BETAHALOETHYL AROMATIC SULFONIC ACID FROM THE REACTION PRODUCTS WITH WATER, TREATING THE AQUEOUS EXTRACT WITH AN ALKALI IN AMOUNT AT LEAST AS GREAT AS THAT THEORETICALLY REQUIRED TO NEUTRALIZE THE SAME AND THE HYDROGEN HALIDE WHICH WOULD RESULT FROM DEHYDROHALOGENATION OF THE BETA-HALOETHYL AROMATIC SULFONIC ACID BY SPLITTING OF A HYDROGEN HALIDE FROM THE BETA-HALOETHYL RADICAL THEREOF, AND REACTING THE ALKALI WITH THE BETA-HALOETHYL AROMATIC SULFONIC ACID AT TEMPERATURES BETWEEN 50* AND 100*C. UNTIL AT LEAST 75 PERCENT OF THE ABOVE-STATE THEORETICAL AMOUNT OF ALKALI IS CONSUMED AND FOR A TIME NOT GREATLY IN EXCESS OF THAT AT WHICH SAID THEORETICAL AMOUNT OF ALKALI IS CONSUMED.
Claim 4
Independent Claim
144 words
A METHOD OF MAKING A SALT OF A VINYL AROMATIC SULFONIC ACID WHICH COMPRISES SULFONATING A BETA-HALOETHYL AROMATIC COMPOUND BY MIXING APPROXIMATELY ITS MOLECULAR EQUIVALENT OF SULFUR TRIOXIDE THEREWITH AT A REACTION TEMPERATURE BELOW 80*C., EXTRACTING THE RESULTING BETAHALOETHYL AROMATIC SULFONIC ACID FROM THE REACTION PRODUCTS WITH WATER, TREATING THE AQUEOUS EXTRACT WITH AN ALKALI IN AMOUNT AT LEAST AS GREAT AS THAT THEORETICALLY REQUIRED TO NEUTRALIZE THE SAME AND THE HYDROGEN HALIDE WHICH WOULD RESULT FROM DEHYDROHALOGENATION OF THE BETA-HALOETHYL AROMATIC SULFONIC ACID BY SPLITTING OF A HYDROGEN HALIDE FROM THE BETA-HALOETHYL RADICAL THEREOF, AND REACTING THE ALKALI WITH THE BETA-HALOETHYL AROMATIC SULFONIC ACID AT TEMPERATURES BETWEEN 50* AND 100*C. UNTIL AT LEAST 75 PERCENT OF THE ABOVE-STATE THEORETICAL AMOUNT OF ALKALI IS CONSUMED AND FOR A TIME NOT GREATLY IN EXCESS OF THAT AT WHICH SAID THEORETICAL AMOUNT OF ALKALI IS CONSUMED.
References Cited (Backward Citations)
US1422564A
Cited
US1999955A
Cited
US2322258A
Cited
US2283236A
Cited
US2404538A
Cited
US2573675A
Cited
US2564506A
Cited
US2678947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |