US2721875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing aminomethyl-sulfonic acids
Assignee: ExxonMobil Oil Corp
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Filing: 1952-04-07
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Granted: 1955-10-25
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Expires: 1972-04-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph J Dickert
- 👤 Howard D Hartough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:19
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/13; C07C309/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD FOR PREPARING AN AMINOMETHYLSULFONIC ACID TYPE COMPOUND, WHICH COMPRISES REACTING, IN DILUTE AQUEOUS ACIDIC MEDIUM, SULFUR DIOXIDE AND AN AMINO COMPOUND-ALDEHYDE COMBINATION SELECTED FROM THE GROUP CONSISTING OF (1) AMMONIA AND FORMALDEHYDE, (2) HEXAMETHYLENETETRAMINE, (3) AN AMMONIUM, CHLORIDE AND FORMALDEHYDE, (4) A LOWER ALKYL AMINE CONTAINING LABILE HYDROGEN AND FORMALDEHYDE, AND (5) AN ARYL AMINE CONTAINING LABILE HYDROGEN AND FORMALDEHYDE, AT A TEMPERATURE VARYING BETWEEN ABOUT 15* C. AND ABOUT 80* C.
Claim 2
Independent Claim
74 words
A METHOD FOR PREPARING AN AMINOMETHYLSULFONIC ACID TYPE COMPOUND, WHICH COMPRISES REACTING, IN DILUTE AQUEOUS ACIDIC MEDIUM, SULFUR DIOXIDE AND AN AMINO COMPOUND-ALDEHYDE COMBINATION SELECTED FROM THE GROUP CONSISTING OF (1) AMMONIA AND FORMALDEHYDE, (2) HEXAMETHYLENETETRAMINE, (3) AN AMMONIUM, CHLORIDE AND FORMALDEHYDE, (4) A LOWER ALKYL AMINE CONTAINING LABILE HYDROGEN AND FORMALDEHYDE, AND (5) AN ARYL AMINE CONTAINING LABILE HYDROGEN AND FORMALDEHYDE, AT A TEMPERATURE VARYING BETWEEN ABOUT 15* C. AND ABOUT 80* C.
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) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |