US4551253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing oil from water with an absorbent
Assignee: UNIVERSAL FIBERS Inc A DE CORP
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Filing: 1984-01-20
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Granted: 1985-11-05
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Expires: 2004-01-20
Abstract
Abstract Disclosed herein is an absorbent, particularly useful for the sorption of oil or other petroleum-based products contaminating a body of water. The absorbent is prepared by subjecting sulphite reject from a paper mill process, or a combination of sulphite reject and sulphate reject from a paper mill process, to rapid forced heating at a temperature effective to gasify moisture in the starting material and the cause the starting material to expand or burst.
Inventors
- 👤 Bo Grenthe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:31
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/24; B01J20/28; B01J20/28014; B01J20/28023; B01J20/30; B01J20/3078; B01J20/32; B01J20/3202; B01J20/3206; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; C; C09; C09K; C09K3/00; C09K3/32; B01J2220/00; B01J2220/40; B01J2220/48; B01J2220/4812; B01J2220/4825; B01J2220/4831; B01J2220/4875; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/924
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A method for removing oil or other petroleum-based products contaminating a body of water, comprising dispersing over the contaminated water an amount of an absorbent material sufficient to substantially absorb the oil or petroleum-based products therefrom, said absorbent material comprising the fibrous product obtained by subjecting a moisture-containing fibrous starting material, consisting essentially of a member selected from the group consisting of sulphite reject from a paper mill process, and a combination of sulfite reject and sulphate reject from a paper mill process, to rapid forced heating at temperatures effective to gasify moisture in said starting material and to cause said starting material to expand or burst.
Claim 2
Independent Claim
107 words
A method for removing oil or other petroleum-based products contaminating a body of water, comprising dispersing over the contaminated water an amount of an absorbent material sufficient to substantially absorb the oil or petroleum-based products therefrom, said absorbent material comprising the fibrous product obtained by subjecting a moisture-containing fibrous starting material, consisting essentially of a member selected from the group consisting of sulphite reject from a paper mill process, and a combination of sulfite reject and sulphate reject from a paper mill process, to rapid forced heating at temperatures effective to gasify moisture in said starting material and to cause said starting material to expand or burst.
Claim 3
Dependent Claim
18 words
The method according to claim 1 wherein said starting material is sulphite reject from a paper mill process.
Claim 4
Dependent Claim
25 words
A method according to claim 2 wherein said sulphite reject consists predominantly of the fine fraction of sulphite reject obtained from a paper mill process.
Claim 5
Dependent Claim
24 words
A method according to claim 1 wherein said starting material is a combination of sulfite reject and sulphate reject from a paper mill process.
Claim 6
Dependent Claim
27 words
A method according to claim 1 wherein the temperature of said rapid forced heating is in the range of from about 300° C. to about 1000° C.
Claim 7
Dependent Claim
27 words
The method according to claim 1 wherein said fibrous product resulting from said rapid forced heating is thereafter treated to apply a thin coat of wax thereon.
Claim 8
Dependent Claim
22 words
The method according to claim 1 wherein said absorbent material dispersed over the contaminated water is confined in a netted containing means.
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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |