Patent US4284726A successfully refreshed from Google Patents.
US4284726A
Expired / Lapsed
US
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Composite anion adsorbent and method for making same
Assignee: Individual
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Filing: 1979-05-14
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Granted: 1981-08-18
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Expires: 1999-05-14
Abstract
Abstract A composite anion adsorbent which includes a dehydration cured composite gel of an organic hydrophilic polymer and a metal hydroxide. In the preferred embodiment, the metal hydroxide is a hydroxide such as iron hydroxide, aluminum hydroxide, titanium hydroxide, manganese hydroxide, tin hydroxide and zirconium hydroxide and oxides which form hydroxides in aqueous solutions.
Inventors
- 👤 Yasumasa Shigetomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:05
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28047; B01J20/02; B01J20/06; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C22; C22B; C22B3/00; C22B3/20; C22B3/42; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265; C22B60/0273; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A method for producing a composite anion adsorbent comprising the steps of: preparing organic hydrophilic polymer gel using a compound selected from the group consisting of formalin-crosslinked polyacrylamide, formalin-crosslinked polyvinyl alcohol, metal-crosslinked polyvinyl alcohol, urea-formaldehyde, and formalin-crosslinked dibenzalsorbitol; mixing into the organic hydrophilic polymer gel an inorganic adsorbent or combination thereof selected from the group consisting of iron hydroxide, hydrated iron oxide, aluminum hydroxide, hydrated aluminum oxide, titanium hydroxide, hydrated titanium oxide, titanic acid, manganese hydroxide, hydrated manganese oxide, tin hydroxide, stannic acid, zirconium hydroxide, hydrated zirconium oxide; and dehydrating the mixture thus prepared under 50°-100° C.
Claim 2
Independent Claim
97 words
A method for producing a composite anion adsorbent comprising the steps of: preparing organic hydrophilic polymer gel using a compound selected from the group consisting of formalin-crosslinked polyacrylamide, formalin-crosslinked polyvinyl alcohol, metal-crosslinked polyvinyl alcohol, urea-formaldehyde, and formalin-crosslinked dibenzalsorbitol; mixing into the organic hydrophilic polymer gel an inorganic adsorbent or combination thereof selected from the group consisting of iron hydroxide, hydrated iron oxide, aluminum hydroxide, hydrated aluminum oxide, titanium hydroxide, hydrated titanium oxide, titanic acid, manganese hydroxide, hydrated manganese oxide, tin hydroxide, stannic acid, zirconium hydroxide, hydrated zirconium oxide; and dehydrating the mixture thus prepared under 50°-100° C.
Claim 3
Dependent Claim
33 words
A method for producing a composite anion adsorbent according to claim 1, wherein said organic hydrophilic polymer is prepared by polymerizing acrylamide with formalin in aqueous iron chloride together with a polymerzation initiator.
Claim 4
Dependent Claim
26 words
A method for producing a composite anion adsorbent according to claim 2, wherein said inorganic adsorbent is a combination of iron hydroxide and hydrated iron oxide.
Claim 5
Dependent Claim
20 words
A method for producing a composite anion adsorbent according to claim 3, further comprising the step of neutralizing the mixture.
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |