Patent US4483799A successfully refreshed from Google Patents.
US4483799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy alkane sulfonic acid sulfoalkyl esters
Assignee: Agfa Gevaert AG
•
Filing: 1981-02-02
•
Granted: 1984-11-20
•
Expires: 2001-02-02
Abstract
Abstract Sulfoalkylating agents free from sultones may be obtained by heating hydroxy alkane sulfonic acids of propane or butane or the corresponding sultones having 5 or 6 ring members with up to four times the molar quantity of water to a temperature in the region of from 80° to 180° C. The sulfoalkylating agents are believed to be the "dimeric esters" of the hydroxy alkane sulfonic acids.
Inventors
- 👤 Helmut Kampfer
- 👤 Detlef Wendisch
- 👤 Marie Hase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:03
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/08; C07D263/60; C07D277/00; C07D277/60; C07D277/62; C07D277/64; C07D277/84; C07D293/00; C07D293/10; C07D293/12; C09; C09B; C09B23/00; C09B23/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
Sulfoalkylating agent, obtainable by heating 3-hydroxypropane sulfonic acid or 1,3-propane sultone to a temperature in the region of from 80° to 180° C. in the presence of water in an amount of from 1 to 4 moles per mole of 3-hydroxy propane sulfonic acid or 1,3-propane sultone, and characterized by the following 13 C-NMR-shifts (ppm, relative to TMS=0, in D 2 O in the presence of dioxane): 25.2; 27.8; 48,8; 61.1 and 69.5.
Claim 2
Dependent Claim
73 words
Sulfoalkylating agent, obtainable by heating 3-hydroxypropane sulfonic acid or 1,3-propane sultone to a temperature in the region of from 80° to 180° C. in the presence of water in an amount of from 1 to 4 moles per mole of 3-hydroxy propane sulfonic acid or 1,3-propane sultone, and characterized by the following 13 C-NMR-shifts (ppm, relative to TMS=0, in D 2 O in the presence of dioxane): 25.2; 27.8; 48,8; 61.1 and 69.5.
Claim 3
Dependent Claim
68 words
Sulfoalkylating agent, obtainable by heating 4-hydroxy butane-2-sulfonic acid or 3-methyl-1,3-propane sultone to a temperature in the region of from 80° to 180° C. in the presence of water in an amount of from 1 to 4 moles per mol of 4-hydroxy-butane-2-sulfonic acid or 3-methyl-1,3-propane sultone, and characterized by the following 13 C-NMR-shifts (ppm, relative to TMS=0, in the presence of dioxane): 15.4; 31.7; 34.4; 53.6; 60.0 and 68.5.
Claim 4
Dependent Claim
68 words
Sulfoalkylating agent, obtainable by heating 4-hydroxy butane-2-sulfonic acid or 3-methyl-1,3-propane sultone to a temperature in the region of from 80° to 180° C. in the presence of water in an amount of from 1 to 4 moles per mol of 4-hydroxy-butane-2-sulfonic acid or 3-methyl-1,3-propane sultone, and characterized by the following 13 C-NMR-shifts (ppm, relative to TMS=0, in the presence of dioxane): 15.4; 31.7; 34.4; 53.6; 60.0 and 68.5.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |