Patent US4191610A successfully refreshed from Google Patents.
US4191610A
Expired / Lapsed
US
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Upgrading waste paper by treatment with sulfite waste liquor
Assignee: Individual
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Filing: 1978-09-01
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Granted: 1980-03-04
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Expires: 1998-09-01
Abstract
Abstract Fibrous materials are disclosed having incorporated therein upgraded waste sulphite liquor; the liquor is neutralized, e. g., with sodium borate, sodium aluminate, reacidified, if needed, with alum; the modified sulphite waste liquor of hardwoods as well as articles of manufacture of fibrous materials such as corrugated medium made of waste materials are diclosed; further, articles of manufacture thus modified include starch or sizing and are within the scope of the invention.
Inventors
- 👤 Eric S. Prior
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:45
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/01; D21H17/20; D21H17/21; D21H17/23; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
55 words
An article of manufacture comprising a cellulosic fibrous sheet material having incorporated therein, at the wet press or size press, from about 5 to 30 percent by weight of waste sulfite liquor, which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate prior to addition to said sheet material.
Claim 2
Dependent Claim
55 words
An article of manufacture comprising a cellulosic fibrous sheet material having incorporated therein, at the wet press or size press, from about 5 to 30 percent by weight of waste sulfite liquor, which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate prior to addition to said sheet material.
Claim 3
Dependent Claim
33 words
The article of manufacture as defined in claim 1 wherein said waste sulfite liquor is reacidified after neutralization but prior to addition to said sheet material to a pH of 4 to 6.
Claim 4
Dependent Claim
113 words
As an article of manufacture, a dried cellulosic corrugated medium, including waste fiber material, to which has been added at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste liquor having been neutralized prior to addition to said medium to a pH of about 6.5 to 8.0 with sodium aluminate, said waste liquor having further been reacidified prior to addition to said medium to a pH of 5 to 6 with alum and wherein ethylene oxide polymer is added thereto in an amount from about 0.25 to 3 grams per 100 grams of waste liquor at 45 to 50 percent solids concentration.
Claim 5
Dependent Claim
113 words
As an article of manufacture, a dried cellulosic corrugated medium, including waste fiber material, to which has been added at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste liquor having been neutralized prior to addition to said medium to a pH of about 6.5 to 8.0 with sodium aluminate, said waste liquor having further been reacidified prior to addition to said medium to a pH of 5 to 6 with alum and wherein ethylene oxide polymer is added thereto in an amount from about 0.25 to 3 grams per 100 grams of waste liquor at 45 to 50 percent solids concentration.
Claim 6
Dependent Claim
17 words
The article of manufacture as defined in claim 3, wherein the waste fiber is corrugated box clippings.
Claim 7
Dependent Claim
18 words
The article of manufacture as defined in claim 3, wherein the waste fiber material is mixed waste fiber.
Claim 8
Dependent Claim
15 words
The article of manufacture as defined in claim 3, wherein the medium is semi-chemical pulp.
Claim 9
Dependent Claim
19 words
The article of manufacture as defined in claim 3, wherein the waste fiber material is No. 2 waste fiber.
Claim 10
Dependent Claim
63 words
As an article of manufacture, a cellulosic fibrous sheet material having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate prior to addition to said sheet material and wherein said waste liquor includes polyethylene oxide.
Claim 11
Dependent Claim
63 words
As an article of manufacture, a cellulosic fibrous sheet material having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate prior to addition to said sheet material and wherein said waste liquor includes polyethylene oxide.
Claim 12
Dependent Claim
24 words
The article of manufacture as defined in claim 8, wherein said waste liquor is reacidified to a pH of 4 to 6 with alum.
Claim 13
Dependent Claim
65 words
As an article of manufacture, a dried cellulosic corrugated medium having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate, and reacidified to a pH of 4 to 6 with alum prior to addition to said medium.
Claim 14
Dependent Claim
65 words
As an article of manufacture, a dried cellulosic corrugated medium having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate, and reacidified to a pH of 4 to 6 with alum prior to addition to said medium.
Claim 15
Dependent Claim
20 words
The article of manufacture as defined in claim 10, wherein ethylene oxide polymer is added to said neutralized sulfite liquor.
Claim 16
Dependent Claim
94 words
As an article of manufacture, a dried cellulosic corrugated medium, including waste fiber material, to which has been added at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste liquor having been neutralized prior to addition to said medium to a pH of about 6.5 to 8.0 with sodium aluminate and wherein ethylene oxide polymer is added to said waste liquor in an amount from about 0.25 to 3 grams per 100 grams of waste liquor at 45 to 50 percent solids concentration.
Claim 17
Dependent Claim
94 words
As an article of manufacture, a dried cellulosic corrugated medium, including waste fiber material, to which has been added at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste liquor having been neutralized prior to addition to said medium to a pH of about 6.5 to 8.0 with sodium aluminate and wherein ethylene oxide polymer is added to said waste liquor in an amount from about 0.25 to 3 grams per 100 grams of waste liquor at 45 to 50 percent solids concentration.
Claim 18
Dependent Claim
17 words
The article of manufacture as defined in claim 12, wherein the waste fiber is corrugated box clippings.
Claim 19
Dependent Claim
18 words
The article of manufacture as defined in claim 12, where the waste fiber material is mixed waste fiber.
Claim 20
Dependent Claim
15 words
The article of manufacture as defined in claim 12, wherein the medium comprises semi-chemical pulp.
Claim 21
Dependent Claim
19 words
The article of manufacture as defined in claim 12, wherein the waste fiber material is No. 2 waste fiber.
Claim 22
Dependent Claim
59 words
As an article of manufacture, a corrugated medium comprising cellulose fibers including waste fibers and from about 5 to 30 percent by weight of waste sulfite liquor which has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate and reacidified with alum prior to addition to said medium at the wet press or size press.
Claim 23
Dependent Claim
59 words
As an article of manufacture, a corrugated medium comprising cellulose fibers including waste fibers and from about 5 to 30 percent by weight of waste sulfite liquor which has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate and reacidified with alum prior to addition to said medium at the wet press or size press.
Claim 24
Dependent Claim
62 words
As a cellulosic fibrous sheet material, a corrugated medium and a linerboard material having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste sulfite liquor having been neutralized with sodium aluminate to a pH of 6.5 to 8, and reacidified with alum prior to addition to said medium.
Claim 25
Dependent Claim
62 words
As a cellulosic fibrous sheet material, a corrugated medium and a linerboard material having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste sulfite liquor having been neutralized with sodium aluminate to a pH of 6.5 to 8, and reacidified with alum prior to addition to said medium.
Claim 26
Dependent Claim
17 words
The sheet material as defined in claim 18, wherein starch is also incorporated in said sheet material.
Claim 27
Dependent Claim
18 words
The sheet material as defined in claim 18, wherein a sizing agent is incorporated in the sheet material.
Claim 28
Dependent Claim
45 words
The article of manufacture as defined in claim 18, wherein the linerboard comprises the waste sulfite liquor and starch and starch is added in the amount of from 1 to 5 percent by weight of a 100 to 450 gram sheet of 1 square meter.
Claim 29
Dependent Claim
20 words
The linerboard material as defined in claim 18, wherein said waste sulfite liquor is a softwood or hardwood sulfite liquor.
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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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |