Patent US3923876A successfully refreshed from Google Patents.
US3923876A
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Complex formers for polyvalent metal ions
Assignee: Bayer AG
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Filing: 1973-04-09
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Granted: 1975-12-02
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Expires: 1993-04-09
Abstract
Abstract The present invention relates to compounds of the general formula in which X represents the group and wherein R is a hydrogen atom, an alkyl radical with 1 to 4 C-atoms or a phenyl radical. These compounds may be used for the preparation of complex compounds with polyvalent metal ions.
Inventors
- 👤 Arnold Heins
- 👤 Helmut Blum
- 👤 Karl-Heinz Worms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:56
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3839; C07F9/3869; C11; C11D; C11D3/00; C11D3/16; C11D3/36; C11D3/365
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
16 words
A complex of claim 1 wherein M is sodium and the alkaline earth metal is calcium.
Claim 4
Dependent Claim
25 words
A complex of claim 1 where the alkaline earth metal ions are selected from the group consisting of magnesium, calcium, strontium, barium and mixtures thereof.
Claim 5
Dependent Claim
9 words
A compound of claim 1 wherein M is hydrogen.
Claim 6
Dependent Claim
11 words
A compound of claim 1 which is 1-phosphonopropane-1, 2, 3-tricarboxylic acid.
Claim 7
Dependent Claim
11 words
A compound of claim 1 which is 1, 1-diphosphonopropane -2,3-dicarboxylic acid.
Claim 8
Dependent Claim
12 words
A compound of claim 1 which is 1-phosphonobutane -2, 3, 4-tricarboxylic acid.
Claim 9
Dependent Claim
11 words
A compound of claim 1 which is 2-phosphonobutane-2, 3, 4-tricarboxylic acid.
Claim 10
Dependent Claim
11 words
A compound of claim 1 which is 2, 2,-diphosphonobutane-3, 4-dicarboxylic acid.
Claim 11
Dependent Claim
17 words
A compleX of claim 1 which is 2-phoshonobutane-2, 3, 4-tricarboxylic acid sodium salt complexed with calcium ions.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |