Patent US4228300A successfully refreshed from Google Patents.
US4228300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarboxylate ethers
Assignee: Monsanto Co
•
Filing: 1972-05-15
•
Granted: 1980-10-14
•
Expires: 1992-05-15
Abstract
Abstract Compounds having the formula ##STR1## wherein M is an alkali metal or ammonium, R 1 and R 2 are hydrogen, methyl or ethyl and R 3 is hydrogen, methyl, ethyl or COOM are useful sequestrants and detergency builders. Lower alkyl esters and acids of such compounds are useful intermediates for their production.
Inventors
- 👤 Kent P. Lannert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:45
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2075; C11D3/2089; C07; C07C; C07C59/00; C07C59/235; C07C59/305
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
Compounds having the formula ##STR9## wherein R is selected from the group consisting of hydrogen, methyl, ethyl, alkali metal and ammonium; R 1 and R 2 are selected from the group consisting of hydrogen, methyl, and ethyl; and R 3 is selected from the group consisting of hydrogen, methyl, ethyl and COOR.
Claim 2
Dependent Claim
52 words
Compounds having the formula ##STR9## wherein R is selected from the group consisting of hydrogen, methyl, ethyl, alkali metal and ammonium; R 1 and R 2 are selected from the group consisting of hydrogen, methyl, and ethyl; and R 3 is selected from the group consisting of hydrogen, methyl, ethyl and COOR.
Claim 3
Dependent Claim
9 words
The compounds of claim 1 wherein R is sodium.
Claim 4
Dependent Claim
18 words
A compound according to claim 1 wherein R 1 , R 2 , and R 3 are hydrogen.
Claim 5
Dependent Claim
19 words
A compound according to claim 1 wherein R 1 is methyl and R 2 and R 3 are hydrogen.
Claim 6
Dependent Claim
19 words
A compound according to claim 1 wherein R 1 and R 2 are methyl and R 3 is hydrogen.
Claim 7
Dependent Claim
19 words
A compound according to claim 1 wherein R 2 is methyl and R 1 and R 3 are hydrogen.
Claim 8
Dependent Claim
11 words
A compound according to claim 1 wherein R 3 is COOR.
Claim 9
Dependent Claim
14 words
A compound according to claim 7 wherein R 1 and R 2 are hydrogen.
Claim 10
Dependent Claim
14 words
A compound according to claim 7 wherein R 1 and R 2 are methyl.
Claim 11
Dependent Claim
16 words
A compound according to claim 7 wherein R 1 is methyl and R 2 is hydrogen.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |