Patent US3635894A successfully refreshed from Google Patents.
US3875697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross linking of acrylamide polymers
Assignee: Labofina SA
•
Filing: 1973-01-24
•
Granted: 1975-04-08
•
Expires: 1993-01-24
Abstract
Abstract A process for the cross-linking of polymers of acrylamide comprising treating an aqueous solution of said polymers at a temperature of from 0.degree.C to 100.degree.C with an aqueous solution of a salt selected from the group consisting of the hypochlorite and hypobromite salts of alkali metals and alkalineearth metals.
Inventors
- 👤 William J I Bracke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:46
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/40; C09K17/48; C08; C08K; C08K3/00; C08K3/16; C08K3/18; C08K3/24; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; Y; Y10; Y10S; Y10S106/00; Y10S106/90; Y10S106/901; Y10S111/00; Y10S111/915; Y10S111/917; Y10S260/00; Y10S260/31; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A METHOD FOR COMBINED SEEDING AND CONSOLIDATION OF SOIL COMPRISING SPRAYING SAID CONJOINTLY WITH AN AQUEOUS SOLUTION OF AN ACRYLAMIDE POLYMER AND AN AQUEOUS SOLUTION A SALT SELECTED FROM THE GROUP CONSISTING OF THE HYPOCHLORIDE AND HYPOBROMIDE SALTS OF ALKALI METALS AND ALKALINE EARTH METALS AND DISTRIBUTING SEEDS UPON SAID SOIL PRIOR TO CROSS-LINKING OF SAID ACRYLAMIDE POLYMER BY SAID SALT.
Claim 2
Independent Claim
61 words
A METHOD FOR COMBINED SEEDING AND CONSOLIDATION OF SOIL COMPRISING SPRAYING SAID CONJOINTLY WITH AN AQUEOUS SOLUTION OF AN ACRYLAMIDE POLYMER AND AN AQUEOUS SOLUTION A SALT SELECTED FROM THE GROUP CONSISTING OF THE HYPOCHLORIDE AND HYPOBROMIDE SALTS OF ALKALI METALS AND ALKALINE EARTH METALS AND DISTRIBUTING SEEDS UPON SAID SOIL PRIOR TO CROSS-LINKING OF SAID ACRYLAMIDE POLYMER BY SAID SALT.
Claim 3
Dependent Claim
37 words
The method as defined in claim 1, wherein the acrylamide polymer is selected from the group consisting of homopolyacrylamide and copolymers containing a major portion of acrylamide monomer and a minor portion of a monomer copolymerizable therewith.
Claim 4
Dependent Claim
22 words
The method as defined in claim 1 wherein the acrylamide polymer has a molecular weight of from about 50,000 to about 1,500,000.
Claim 5
Dependent Claim
30 words
The method as defined by claim 1, wherein the weight ratio calculated on a dry basis between the acrylamide polymer and the salt is from about 1:1 to about 20:1.
Claim 6
Dependent Claim
23 words
The method as defined by claim 1, wherein the aqueous salt solution contains from about 0.5 to 10% by weight of said salt.
Claim 7
Dependent Claim
22 words
The method as defined by claim 5, wherein the aqueous solution contains from about 1 to 3% by weight of said salt.
Claim 8
Dependent Claim
26 words
The method as defined by claim 1, wherein said aqueous solution of acrylamide polymer and said aqueous solution of salt are mixed before spraying said soil.
Claim 9
Dependent Claim
23 words
The method as defined by claim 1, wherein said seeds are dispersed in said aqueous solution of acrylamide polymer before spraying said soil.
Claim 10
Dependent Claim
16 words
The method as defined by claim 1, wherein said salt is sodium hypochlorite or sodium hypobromite.
Claim 11
Dependent Claim
30 words
The method as defined by claim 1, wherein said soil is sprayed with from about 0.5 to 5 liters of aqueous acrylamide polymer solution per square meter of said surface.
Claim 12
Dependent Claim
20 words
The method as defined by claim 1, wherein the aqueous salt solution has a pH of between 5 and 11.
Claim 13
Dependent Claim
25 words
The method as defined by claim 1, wherein said aqueous solution of acrylamide polymer contains between about 1 and 10% by weight of said polymer.
References Cited (Backward Citations)
US3640021A
Cited
US3635742A
Cited
US3677014A
Cited
US3759857A
Cited
US3763072A
Cited
US3705467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |