US4219672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ether carboxylic acids
Assignee: Henkel AG and Co KGaA
•
Filing: 1972-01-28
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Granted: 1980-08-26
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Expires: 1992-01-28
Abstract
Abstract Novel ethercarboxylic acids and their salts containing at least two carboxylic acids and at least one glycolic acid ether, useful as sequestering agents for alkaline earth metal ions, as well as a process for their preparation.
Inventors
- 👤 Gerhard Borggrefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:48
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2075; C11D3/2089; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C07; C07C; C07C59/00; C07C59/235; C07C59/305; C07D; C07D319/00; C07D319/10; C07D319/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
An ethercarboxylic acid compound selected from the group consisting of (1) a compound selected from the group consisting of O-carboxymethyl-citric acid, tris-O-carboxymethyl-1,1,1-trimethylolpropane, tris-O-carboxymethyl-1,1,1-trimethylolethane and bis-O-carboxymethyl-glyceric acid; and (2) a salt of said compound selected from the group consisting of alkali metal salts, ammonium salts, lower alkylamine salts, lower alkylolamine salts and the mixtures thereof.
Claim 2
Dependent Claim
54 words
An ethercarboxylic acid compound selected from the group consisting of (1) a compound selected from the group consisting of O-carboxymethyl-citric acid, tris-O-carboxymethyl-1,1,1-trimethylolpropane, tris-O-carboxymethyl-1,1,1-trimethylolethane and bis-O-carboxymethyl-glyceric acid; and (2) a salt of said compound selected from the group consisting of alkali metal salts, ammonium salts, lower alkylamine salts, lower alkylolamine salts and the mixtures thereof.
Claim 3
Dependent Claim
57 words
The ethercarboxylic acid compound of claim 1, which is selected from the group consisting of (1) a compound selected from the group consisting of O-carboxymethyl-citric acid, and bis-O-carboxymethyl-glyceric acid; and (2) a salt of said compound selected from the group consisting of alkali metal salts, ammonium salts, lower alkylamine salts, lower alkylolamine salts and the mixtures thereof.
Claim 4
Dependent Claim
2 words
O-carboxymethyl-citric acid.
Claim 5
Dependent Claim
2 words
O-carboxymethyl-citric acid.
Claim 6
Dependent Claim
1 words
Tris-O-carboxymethyl-1,1,1-trimethylol-ethane.
Claim 7
Dependent Claim
1 words
Tris-O-carboxymethyl-1,1,1-trimethylol-ethane.
Claim 8
Dependent Claim
2 words
Bis-O-carboxymethyl-glyceric acid.
Claim 9
Dependent Claim
2 words
Bis-O-carboxymethyl-glyceric acid.
Claim 10
Dependent Claim
1 words
Tris-o-carboxymethyl-1,1,1-trimethylolpropane.
Claim 11
Dependent Claim
1 words
Tris-o-carboxymethyl-1,1,1-trimethylolpropane.
References Cited (Backward Citations)
US3725290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |