US3972922A
Expired / Lapsed
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Process for preparing ether tricarboxylates
Assignee: Monsanto Co
•
Filing: 1974-03-18
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Granted: 1976-08-03
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Expires: 1994-03-18
Abstract
Abstract Sequestrant compounds represented by the ##EQU1## wherein X is alkali metal or hydrogen, are prepared by oxidation of a compound represented by the formula ##EQU2##
Inventors
- 👤 Russel D. Harken
- 👤 F. Wyman Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:26
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/235; C07C59/305; C07C51/00; C07C51/16; C07C51/31
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A process for making compounds represented by the formula ##EQU3##wherein X is alkali metal or hydrogen said process comprising oxidizing a compound represented by the formula ##EQU4##said oxidation being conducted utilizing an oxidizing agent having an oxidation potential at least equivalent to that of CrO 3 .
Claim 2
Dependent Claim
47 words
A process for making compounds represented by the formula ##EQU3##wherein X is alkali metal or hydrogen said process comprising oxidizing a compound represented by the formula ##EQU4##said oxidation being conducted utilizing an oxidizing agent having an oxidation potential at least equivalent to that of CrO 3 .
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the oxidation is conducted in acid medium to yield the ether tricarboxylic acid ##STR7##and further comprising converting said ether tricarboxylic acid to the salt ##STR8##wherein M is alkali metal.
Claim 4
Dependent Claim
33 words
The process of claim 2 wherein the oxidation is conducted using CrO 3 as an oxidizing agent and the ether tricarboxylic acid is esterified and the resulting ester reacted with alkali metal hydroxide.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |