Patent US4311552A successfully refreshed from Google Patents.
US4311552A
Expired / Lapsed
US
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Deinking of newsprint
Assignee: Chemithon Corp
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Filing: 1980-02-19
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Granted: 1982-01-19
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Expires: 2000-02-19
Abstract
Abstract Waste newsprint is defibered in an aqueous bath to which is added a deinking agent. The resulting slurry or pulp is rinsed, drained and formed into paper sheets. The deinking agent is a C14 to C20 alpha olefin sulfonate or a mixture of C18 alpha olefin sulfonate and a non-ionic detergent, depending upon the conditions of the deinking bath.
Inventors
- 👤 Albert Brucato
- 👤 Richard J. Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:26
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; D21C5/025; D21C5/027; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
In a method for deinking cellulosic fibrous material impregnated with ink wherein a mixture of said material and water is stirred in the presence of a deinking agent, an improvement for increasing the brightness of the deinked material, said improvement comprising: using as the deinking agent a deinking agent consisting essentially of a C 15 to C 20 alpha olefin sulfonate; said mixture being at a temperature not substantially less than about 25° C. (77° F.).
Claim 2
Dependent Claim
76 words
In a method for deinking cellulosic fibrous material impregnated with ink wherein a mixture of said material and water is stirred in the presence of a deinking agent, an improvement for increasing the brightness of the deinked material, said improvement comprising: using as the deinking agent a deinking agent consisting essentially of a C 15 to C 20 alpha olefin sulfonate; said mixture being at a temperature not substantially less than about 25° C. (77° F.).
Claim 3
Dependent Claim
19 words
In a method as recited in claim 1 wherein: said deinking agent is a C 18 alpha olefin sulfonate.
Claim 4
Dependent Claim
22 words
In a method as recited in claim 2 wherein: said mixture is at a temperature no less than 40° C. (104° F.).
Claim 5
Dependent Claim
33 words
In a method as recited in claim 3 wherein said stirring step is followed by the step of: rinsing said mixture with water at a temperature no less than 40° C. (104° F.).
Claim 6
Dependent Claim
100 words
In a method for deinking cellulosic fibrous material impregnated with ink wherein a mixture of said material and water is stirred in the presence of a deinking agent, an improvement for increasing the brightness of the deinked material said improvement comprising: using as the deinking agent a deinking agent consisting essentially of a C 18 alpha olefin sulfonate with a non-ionic surface active agent; the ratio of (1) C 18 alpha olefin sulfonate to (2) said non-ionic surface active agent is in the range 19:1 to 1:1 said mixture being at a temperature substantially less than 40° C. (104° F.).
Claim 7
Dependent Claim
100 words
In a method for deinking cellulosic fibrous material impregnated with ink wherein a mixture of said material and water is stirred in the presence of a deinking agent, an improvement for increasing the brightness of the deinked material said improvement comprising: using as the deinking agent a deinking agent consisting essentially of a C 18 alpha olefin sulfonate with a non-ionic surface active agent; the ratio of (1) C 18 alpha olefin sulfonate to (2) said non-ionic surface active agent is in the range 19:1 to 1:1 said mixture being at a temperature substantially less than 40° C. (104° F.).
Claim 8
Dependent Claim
33 words
In a method as recited in claim 5 wherein said stirring step is followed by the step of: rinsing said mixture with water at a temperature no less than 40° C. (104° F.).
Claim 9
Dependent Claim
20 words
In a method as recited in claim 5 wherein: said non-ionic surface active agent is a 9 mol alcohol ethoxylate.
Claim 10
Dependent Claim
111 words
In a method for deinking cellulosic fibrous material impregnated with ink wherein a mixture of said material and water is stirred in the presence of a deinking agent, an improvement for increasing the brightness of the deinked material, said improvement comprising: using as the deinking agent a deinking agent consisting essentially of a C 18 alpha olefin sulfonate with a non-ionic surface active agent; said non-ionic surface active agent being a 9 mol alcohol ethoxylate; the ratio of (1) C 18 alpha olefin sulfonate to (2) said non-ionic surface active agent being in the range 19:1 to 1:1; said mixture being at a temperature substantially less than 40° C. (104° F.).
Claim 11
Dependent Claim
111 words
In a method for deinking cellulosic fibrous material impregnated with ink wherein a mixture of said material and water is stirred in the presence of a deinking agent, an improvement for increasing the brightness of the deinked material, said improvement comprising: using as the deinking agent a deinking agent consisting essentially of a C 18 alpha olefin sulfonate with a non-ionic surface active agent; said non-ionic surface active agent being a 9 mol alcohol ethoxylate; the ratio of (1) C 18 alpha olefin sulfonate to (2) said non-ionic surface active agent being in the range 19:1 to 1:1; said mixture being at a temperature substantially less than 40° C. (104° F.).
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) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |