Patent US3248179A successfully refreshed from Google Patents.
Patent US3935257A successfully refreshed from Google Patents.
US3935257A
Expired / Lapsed
US
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Chemical compounds
Assignee: Monsanto Co
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Filing: 1974-03-18
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Granted: 1976-01-27
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Expires: 1994-03-18
Abstract
Abstract Compounds represented by the formula ##EQU1## wherein M is alkali metal and acids thereof are useful intermediates for preparation of sequestrant compounds represented by the formula ##EQU2## and acids thereof.
Inventors
- 👤 Dennis A. Ruest
- 👤 C. Y. Shen
- 👤 John L. Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:17
CPC Classifications
C; C07; C07F; C07F3/00; C07F3/003; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/23; C07C51/235; C07C59/00; C07C59/235; C07C59/305; C07D; C07D319/00; C07D319/10; C07D319/12; C07F1/00; C07F1/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
5 words
Compounds represented by the formula
Claim 2
Dependent Claim
5 words
Compounds represented by the formula
Claim 3
Dependent Claim
11 words
A compound according to claim 1 represented by the formula ##EQU21##
Claim 4
Independent Claim
57 words
A method of making compounds represented by the formula ##EQU22## wherein M is alkali metal and acids thereof, said method comprising reacting a compound represented by the formula ##EQU23## wherein M' is alkali metal or alkaline earth metal with an alkali metal hydroxide to yield ##EQU24## and, when the acid form thereof is desired, acidulating said ##EQU25##
Claim 5
Independent Claim
57 words
A method of making compounds represented by the formula ##EQU22## wherein M is alkali metal and acids thereof, said method comprising reacting a compound represented by the formula ##EQU23## wherein M' is alkali metal or alkaline earth metal with an alkali metal hydroxide to yield ##EQU24## and, when the acid form thereof is desired, acidulating said ##EQU25##
References Cited (Backward Citations)
US3293176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |