US3226343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovery of polyethylene from cellulosic fibers
Assignee: Champion Papers Inc
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Filing: 1962-04-26
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Granted: 1965-12-28
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Expires: 1982-04-26
Abstract
No abstract record available.
Inventors
- 👤 Philip H Rhodes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:32
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64; Y10; Y10S; Y10S8/00; Y10S8/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
METHOD FOR RECOVERY OF POLYETHYLENE FROM A WATER WET MIXTURE OF WATER-INSOLUBLE MATERIALS CONTAINING A MAJOR WEIGHT PROPORTION OF POLYETHYLENE AND A MINOR WEIGHT PROPORTION OF CELLULOSIC PULP FIBERS, SAID WEIGHT PROPORTIONS BEING ON A DRY BASIS, WHICH COMPRISES: BLENDING SAID WATER WET MIXTURE WITH A POLYETHYLENE SOLVENT HAVING A BOILING POINT IN THE RANGE OF 70* TO 130*C., THE WEIGHT RATIO OF POLYETHYLENE IN SAID MIXTURE TO THE SOLVENT BEING AT LEAST ABOUT 3.0:100, SUBJECTING SAID BLEND TO A TEMPERATURE NO LESS THAN ABOUT 65*C. TO THEREBY DISSOLVE THE POLYETHYLENE, SEPARATING THE SOLVENT AND POLYETHYLENEN SOLUTE FROM THE FIBERS, AND THEREAFTER RECOVERING THE POYETHYLENE THEREFROM, THE SAID SOLVENT BEING WATER-IMMISCIBLE AND PREDOMINATELY ALKANES, A MAJOR WEIGHT PROPORTION OF WHICH ARE C7 TO C8.
Claim 2
Dependent Claim
124 words
METHOD FOR RECOVERY OF POLYETHYLENE FROM A WATER WET MIXTURE OF WATER-INSOLUBLE MATERIALS CONTAINING A MAJOR WEIGHT PROPORTION OF POLYETHYLENE AND A MINOR WEIGHT PROPORTION OF CELLULOSIC PULP FIBERS, SAID WEIGHT PROPORTIONS BEING ON A DRY BASIS, WHICH COMPRISES: BLENDING SAID WATER WET MIXTURE WITH A POLYETHYLENE SOLVENT HAVING A BOILING POINT IN THE RANGE OF 70* TO 130*C., THE WEIGHT RATIO OF POLYETHYLENE IN SAID MIXTURE TO THE SOLVENT BEING AT LEAST ABOUT 3.0:100, SUBJECTING SAID BLEND TO A TEMPERATURE NO LESS THAN ABOUT 65*C. TO THEREBY DISSOLVE THE POLYETHYLENE, SEPARATING THE SOLVENT AND POLYETHYLENEN SOLUTE FROM THE FIBERS, AND THEREAFTER RECOVERING THE POYETHYLENE THEREFROM, THE SAID SOLVENT BEING WATER-IMMISCIBLE AND PREDOMINATELY ALKANES, A MAJOR WEIGHT PROPORTION OF WHICH ARE C7 TO C8.
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |