Patent US3852306A successfully refreshed from Google Patents.
US3852306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxymethyl dioxolane polycarboxylates
Assignee: Monsanto Co
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Filing: 1972-05-08
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Granted: 1974-12-03
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Expires: 1992-05-08
Abstract
Abstract Compounds represented by the formula v,2/10 WHEREIN R1 is -COOR7 or -CH2COOR7; R2, R3 and R4 are -COOR7, CH2COOR7, hydrogen or methyl; and R7 is alkali metal or ammonium are useful sequestrants and detergency builders. The lower alkyl ester and acid forms of such compounds are useful intermediates for their production.
Inventors
- 👤 J Rapko
- 👤 R Harken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:57
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2096; C07; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
A COMPOUND REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
6 words
A COMPOUND REPRESENTED BY THE FORMULA
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein R is methyl.
Claim 4
Dependent Claim
9 words
The compound of claim 1 wherein R is sodium.
References Cited (Backward Citations)
US2556135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |