US3865684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for reclaiming pulp from waste papers
Assignee: World-Wide Paper Reclamation
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Filing: 1973-05-25
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Granted: 1975-02-11
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Expires: 1993-05-25
Abstract
Abstract The reclamation of purified and reusable pulps from various types of waste papers by first shredding the paper into fine pieces, boiling the shredded paper in a chemical solution containing an alkali metal hydroxide, an alkali metal carbonate an alkali metal bicarbonate and sodium borate, water washing the chemicals from the cooked paper and then bleaching the pulp with a chemical bleach at elevated temperature.
Inventors
- 👤 C Roy Gleason
- 👤 Gordon A Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:47
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/32; D21C; D21C5/00; D21C5/02; D21C5/025; D21C5/027; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
THE COMPSITION FOR THE RECOVERY OF PULP FROM WASTE PAPERS BY A PROCESS WHICH INCLUDES THE STEP OF COOKING THE WASTE PAPER IN AN AQUEOUS SOLUTION IN WHICH THE COMPOSITION IS PRESENT IN THE DISSOLVED STATE AND IN WHICH THE SOLIDS OF THE COMPOSITION CONSIST ESSENTIALLY OF A. AN ALKALI METAL HYDROXIDE B. AN ALKALI METAL CARBONATE C. AN ALKALI METAL OR AMMONIUM BICARBONATE D. AN ALKALI METAL BORATE AND PRESENT IN THE RATIO OF 100-200 20 PERCENT PARTS BY WEIGHT OF ALKALI METAL HYDROXIDE, 150-250 20 PERCENT PARTS BY WEIGHT ALKALI METAL CARBONATE, 48 20 PERCENT PARTS BY WEIGHT OF THE BICARBONATE AND 56 20 PERCENT PARTS BY WEIGHT OF THE BORATE.
Claim 2
Dependent Claim
113 words
THE COMPSITION FOR THE RECOVERY OF PULP FROM WASTE PAPERS BY A PROCESS WHICH INCLUDES THE STEP OF COOKING THE WASTE PAPER IN AN AQUEOUS SOLUTION IN WHICH THE COMPOSITION IS PRESENT IN THE DISSOLVED STATE AND IN WHICH THE SOLIDS OF THE COMPOSITION CONSIST ESSENTIALLY OF A. AN ALKALI METAL HYDROXIDE B. AN ALKALI METAL CARBONATE C. AN ALKALI METAL OR AMMONIUM BICARBONATE D. AN ALKALI METAL BORATE AND PRESENT IN THE RATIO OF 100-200 20 PERCENT PARTS BY WEIGHT OF ALKALI METAL HYDROXIDE, 150-250 20 PERCENT PARTS BY WEIGHT ALKALI METAL CARBONATE, 48 20 PERCENT PARTS BY WEIGHT OF THE BICARBONATE AND 56 20 PERCENT PARTS BY WEIGHT OF THE BORATE.
Claim 3
Dependent Claim
45 words
The composition as claimed in claim 1 in which the chemicals are present in the ratio of: 100 parts by weight of the hydroxide 250 parts by weight of the carbonate 48 parts by weight of the bicarbonate 56 parts by weight of the borate.
Claim 4
Dependent Claim
24 words
The composition as claimed in claim 1 in which the alkali metal hydroxide is sodium hydroxide and in which the bicarbonate is sodium bicarbonate.
Claim 5
Dependent Claim
26 words
The composition as claimed in claim 1 in which the alkali metal carbonate is sodium carbonate and in which the alkali metal borate is sodium borate.
Claim 6
Dependent Claim
34 words
The composition as claimed in claim 1 in which the chemicals are present in solution in aqueous medium in the concentration of 0.5 to 2 pounds of the chemicals per 20 gallons of solution.
Claim 7
Dependent Claim
31 words
The composition as claimed in claim 1 in which the chemicals are present in solution in aqueous medium in the concentration of 0.8 to 1.2 pounds per 20 gallons of solution.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |