Patent US4466836A successfully refreshed from Google Patents.
US4466836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Set retarding compounds for use in cement slurries
Assignee: Dow Chemical Co
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Filing: 1983-04-28
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Granted: 1984-08-21
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Expires: 2003-04-28
Abstract
Abstract The process of employing as a cement setting retarder a compound which is a phosphonomethylated derivative of a dimer or polymer which is the reaction product of ethylene dichloride or epichlorohydrin with aminoethylpiperazine wherein at least 50% of the amine hydrogen substituents are phosphonomethyl groups or an alkali metal, alkaline earth metal or ammonium salt thereof.
Inventors
- 👤 Druce K. Crump
- 👤 David A. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:19
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/003; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/645; C07F9/6509; C07F9/650952
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
In a process for retarding the setting of an aqueous cement slurry which comprises adding to said slurry an organic phosphonate, the improvement which comprises employing a compound which is the phosphonomethylated reaction product of a dihalo or haloepoxy organic compound with aminoethylpiperazine wherein the mole ratio of dihalo or haloepoxy compound to the amine compound is from about 0.20 to about 1.0, and wherein at least 50% of the amine hydrogens are phosphonomethylated.
Claim 2
Dependent Claim
74 words
In a process for retarding the setting of an aqueous cement slurry which comprises adding to said slurry an organic phosphonate, the improvement which comprises employing a compound which is the phosphonomethylated reaction product of a dihalo or haloepoxy organic compound with aminoethylpiperazine wherein the mole ratio of dihalo or haloepoxy compound to the amine compound is from about 0.20 to about 1.0, and wherein at least 50% of the amine hydrogens are phosphonomethylated.
Claim 3
Dependent Claim
107 words
In a process for retarding the setting of an aqueous cement slurry which comprises adding to said slurry an organic phosphonate, the improvement which comprises employing a compound of the formula A-BA).sub.m wherein A is an organic radical having the formula ##STR5## wherein F is hydrogen, hydroxyethyl, hydroxypropyl, ##STR6## or BA wherein M is hydrogen, an alkali metal, alkaline earth metal or ammonium radical, and wherein B is a divalent radical derived from a dihalo or haloepoxy organic compound having one of the following structures ##STR7## wherein n is 1-10, n' is 1-3, m is 1-10 and at least 50% of the F groups are ##STR8## groups.
Claim 4
Dependent Claim
107 words
In a process for retarding the setting of an aqueous cement slurry which comprises adding to said slurry an organic phosphonate, the improvement which comprises employing a compound of the formula A-BA).sub.m wherein A is an organic radical having the formula ##STR5## wherein F is hydrogen, hydroxyethyl, hydroxypropyl, ##STR6## or BA wherein M is hydrogen, an alkali metal, alkaline earth metal or ammonium radical, and wherein B is a divalent radical derived from a dihalo or haloepoxy organic compound having one of the following structures ##STR7## wherein n is 1-10, n' is 1-3, m is 1-10 and at least 50% of the F groups are ##STR8## groups.
Claim 5
Dependent Claim
14 words
The process of claim 2 wherein m is 1 or 2, B is ##STR9##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |