Patent US4145558A successfully refreshed from Google Patents.
US4145558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester derivatives of ether polycarboxylic acids
Assignee: Lever Brothers Co
•
Filing: 1977-07-07
•
Granted: 1979-03-20
•
Expires: 1997-07-07
Abstract
Abstract Novel polyfunctional compounds which may be hydrolyzed to the corresponding salts, which in turn are metal sequestering agents, are disclosed, as well as a novel method for their preparation. The compounds are the reaction product obtained from the reaction of selected salts of monoalkyl esters of maleic acid with selected active hydrogen containing compounds. These products are prepared by a reaction of the starting materials in preferably a substantially anhydrous medium at an elevated temperature.
Inventors
- 👤 Eddie N. Gutierrez
- 👤 Vincent Lamberti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:08
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/235; C07C59/305; C07C323/00; C07C51/00; C07C51/09
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
60 words
A compound of the general formula ##STR42## wherein R is a primary alkyl group of one to six carbon atoms, wherein M 1 is H, Ca, Mg, Ba, Sr, Na, K or Li, wherein x is 1 or 2 and is equivalent to the valency of M 1 , wherein Y is oxygen, and wherein Z is 2-hydroxyethyl or 3-hydroxypropyl.
Claim 2
Dependent Claim
60 words
A compound of the general formula ##STR42## wherein R is a primary alkyl group of one to six carbon atoms, wherein M 1 is H, Ca, Mg, Ba, Sr, Na, K or Li, wherein x is 1 or 2 and is equivalent to the valency of M 1 , wherein Y is oxygen, and wherein Z is 2-hydroxyethyl or 3-hydroxypropyl.
Claim 3
Dependent Claim
21 words
A compound as defined in claim 1 having the formula ##STR43## wherein said x and M 1 are as previously defined.
References Cited (Backward Citations)
US2062917A
Cited
US2341846A
Cited
US3278593A
Cited
US3700599A
Cited
US3758419A
Cited
US3954858A
Cited
US3862219A
Cited
US3935257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |