US3859337A
Expired / Lapsed
US
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Ethylenediaminetetraacetic acid anhydride derivatives
Assignee: Stauffer Chemical Co
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Filing: 1973-04-11
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Granted: 1975-01-07
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Expires: 1993-04-11
Abstract
Abstract Novel derivatives of ethylenediaminetetraacetic acid anhydride are provided and such derivatives are obtained by directly reacting the anhydride with compounds having a hydrogen atom replaceable by an acyl function. The products thus obtained are useful as chelating agents, coagulants, antistatic agents, etc.
Inventors
- 👤 Jack L Herz
- 👤 Stanley Chaberek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:27
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/18; C07D295/182; C07D295/185; C07C; C07C275/00; C07C275/46; C07C275/48; C07C275/54; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G69/00; C08G69/02; C08G69/26; C08G73/00; C08G73/06; C08G73/10; Y; Y10; Y10S; Y10S260/00; Y10S260/21; Y10S260/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
7 words
ETHYLENEDIAMINETETRAACETIC ACID ANHYDRIDE DERIVATIVES OF THE FORMULA:
Claim 2
Dependent Claim
7 words
ETHYLENEDIAMINETETRAACETIC ACID ANHYDRIDE DERIVATIVES OF THE FORMULA:
Claim 3
Dependent Claim
19 words
An ethylenediamine tetraacetic acid anhydride derivative according to claim 1 which is the symmetrical-bisdihydroxamic acid of ethylenediamine tetraacetic acid.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |