US4164482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent for water purification and process for preparing same
Assignee: Hoechst AG
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Filing: 1977-06-13
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Granted: 1979-08-14
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Expires: 1997-06-13
Abstract
Abstract An absorbent for water purification consisting of organic polymers and inorganic absorbing matter having a large surface is obtained by epitactically linking with each other the two components. The absorbent has good absorbing properties with respect to different classes of substances.
Inventors
- 👤 Harald Berger
- 👤 Karl-Ernst Quentin
- 👤 Ludwig Weil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:00
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/288; B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; B01J20/22; B01J20/26; B01J20/261; B01J20/264; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/30; B01J20/3078; B01J20/3085; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/327; B01J20/3276; B01J2220/00; B01J2220/40; B01J2220/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
23 words
Absorbent for water purification consisting essentially of organic polymer and inorganic absorbing matter, wherein the two components are linked with each other epitactically.
Claim 2
Dependent Claim
23 words
Absorbent for water purification consisting essentially of organic polymer and inorganic absorbing matter, wherein the two components are linked with each other epitactically.
Claim 3
Dependent Claim
19 words
Absorbent as claimed in claim 1, wherein the organic polymer is a homo- or copolymer of ethylenically unsaturated monomers.
Claim 4
Dependent Claim
30 words
Absorbent as claimed in claim 1, wherein the inorganic absorbing matter is aluminum oxide, silica gel, a zeolite, active carbon, bleaching earth, bentonite, fuller's earth, activated bauxite, or activated kieselguhr.
Claim 5
Dependent Claim
30 words
Absorbent as claimed in claim 2, wherein the organic polymer is an ethylene copolymer prepared from more than 50% by weight of ethylene, the balance being other ethylenically unsaturated comonomers.
Claim 6
Dependent Claim
36 words
Absorbent as claimed in claim 2, wherein the organic polymer contains from 99.5 to 85% by weight of ethylene structural units and from 0.5 to 15% by weight of structural units of bis-alkali metal methacrylamide N-sulfonate.
Claim 7
Dependent Claim
14 words
Absorbent as claimed in claim 5, wherein the inorganic absorbing matter is active carbon.
Claim 8
Dependent Claim
32 words
Process for preparing an absorbent for water purification which comprises stirring inorganic absorbing matter into an aqueous dispersion of an organic polymer and bringing about coagulation of the polymer while further stirring.
Claim 9
Dependent Claim
32 words
Process for preparing an absorbent for water purification which comprises stirring inorganic absorbing matter into an aqueous dispersion of an organic polymer and bringing about coagulation of the polymer while further stirring.
Claim 10
Dependent Claim
66 words
Process as claimed in claim 7, which comprises stirring active carbon into an aqueous dispersion, free from emulsifier, of a copolymer consisting of 99.5 to 85% by weight of ethylene structural units and 0.5 to 15% by weight of structural units of bis-alkali metal methacrylamide N-sulfonate und bringing about coagulation by adding a mineral acid to adjust a pH of the dispersion of 1 to 2.
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) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |