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Patent US3929874A successfully refreshed from Google Patents.
US3929874A
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Aminohydroxypolycarboxylic acid compounds
Assignee: Hoechst AG
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Filing: 1973-08-21
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Granted: 1975-12-30
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Expires: 1993-08-21
Abstract
Abstract Y represents hydrogen or methyl and for all the other variants of Z, Y is hydrogen, methyl or lower alkyl or hydroxyalkyl and wherein X is hydrogen or an alkali metal and R3 and R4 independently from each other representing hydrogen, lower alkyl or hydroxyalkyl and R4 furthermore representing the radical (CH2)m-COOX, m being 1 to 4 and X having the above meaning, R5 representing hydrogen or methyl, and p being 2 or 3, and a process for preparing it. or wherein Z is one of the groups -CR3R4-COOX A complexing agent for metal ions, preferably alkaline earth metal ions, which has the general formula III wherein, if Z stands for the group
Inventors
- 👤 Claus Beermann
- 👤 Volker Knittel
- 👤 Walter Dursch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:30
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/26; C11D3/33
Claims Analysis
Total Claims: 6
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
25 words
A process for preparing compounds having a complexing capacity for metal ions, wherein one mole of a compound containing nitrogen corresponding to the formula I
Claim 4
Dependent Claim
25 words
A process for preparing compounds having a complexing capacity for metal ions, wherein one mole of a compound containing nitrogen corresponding to the formula I
Claim 5
Dependent Claim
44 words
A process as claimed in claim 2, wherein the reaction is carried out at a temperature of about 50*C to 100*C in water or in a mixture of water with an inert organic solvent, the portion of water being at least 40% by weight.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 2, wherein the reaction is carried out at a pH-value of about 8 to 13.
References Cited (Backward Citations)
US3799951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |