US4094150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition of matter useful for earthen formation treatment
Assignee: Wyeth Holdings LLC
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Filing: 1976-04-15
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Granted: 1978-06-13
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Expires: 1996-04-15
Abstract
Abstract A gel-forming composition of matter comprising an aqueous solution of a mixture of certain percentages of monomeric acrylamide and monomeric N,N' methylenebisacrylamide and a polymerization catalyst and containing certain percentages of an unfired natural diatomaceous earth having a certain particle size is used in treating earthen formations around the joints of sewer pipes, whereby fluid loss from the composition into the earthen formation is substantially reduced.
Inventors
- 👤 William J. Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/40; C09K17/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A method for treating earth formations around the joints of underground pipes and concrete foundations comprising injecting into the earth formation a gel-forming composition comprising an aqueous solution containing from about 5% to about 20%, by weight, based on the total weight of the solution of a mixture of (A) from about 80% to 99.5%, by weight, of monomeric acrylamide and correspondingly (B) from about 20% to 0.5% by weight of monomeric N,N'-methylenebisacrylamide wherein the percentages by weight of said monomers total 100%, and (C) from about 4% to 20%, by weight, of an unfired natural diatomaceous earth, 80% of which has a particle size between about 2μ and 10μ the percentage by weight of said diatomaceous earth being based on the total weight of the solution and (D) an effective amount of a polymerization catalyst, whereby fluid loss from the gelled composition into the earth formations is substantially reduced.
Claim 2
Independent Claim
150 words
A method for treating earth formations around the joints of underground pipes and concrete foundations comprising injecting into the earth formation a gel-forming composition comprising an aqueous solution containing from about 5% to about 20%, by weight, based on the total weight of the solution of a mixture of (A) from about 80% to 99.5%, by weight, of monomeric acrylamide and correspondingly (B) from about 20% to 0.5% by weight of monomeric N,N'-methylenebisacrylamide wherein the percentages by weight of said monomers total 100%, and (C) from about 4% to 20%, by weight, of an unfired natural diatomaceous earth, 80% of which has a particle size between about 2μ and 10μ the percentage by weight of said diatomaceous earth being based on the total weight of the solution and (D) an effective amount of a polymerization catalyst, whereby fluid loss from the gelled composition into the earth formations is substantially reduced.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein the amount of the monomer mixture present in the solution is between 8% and 15% by weight.
Claim 4
Dependent Claim
30 words
A method according to claim 1 wherein the amount of acrylamide is between about 85% and 96% and the amount of the N,N'methylenebisacrylamide is correspondingly between about 15% and 4%.
Claim 5
Dependent Claim
34 words
A method according to claim 1 in which said diatomaceous earth is present in an amount between about 8% and 15% by weight based on the total weight of the monomer mixture aqueous solution.
Claim 6
Dependent Claim
58 words
A method according to claim 1 wherein the aqueous solution contains an inorganic, hydrated, water-soluble metal salt wherein said metal is selected from the group consisting of alkaline earth metals, aluminum and chromium and said salt is present in a weight ratio of said monomer mix to said salt in the range between about 1:1.5 to 1:12 respectively.
Claim 7
Dependent Claim
16 words
A method according to claim 5 wherein said inorganic, hydrated, water-soluble metal salt is calcium chloride.
Claim 8
Dependent Claim
17 words
A method according to claim 1 wherein said earth formation is in contact with a sewer pipe.
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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |