Patent US2865701A successfully refreshed from Google Patents.
US2865701A
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US
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Process of bleaching kraft pulp with alkaline hypochlorite bleach acidifying the pulp containing residual chlorine and then bleaching with alkaline peroxide
Assignee: Millennium Petrochemicals Inc
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Filing: 1953-12-07
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Granted: 1958-12-23
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Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 Willard F Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:19
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR PRODUCING A KRAFT PULP OF IMPROVED BRIGHTNESS STABILITY AND STRENGTH WHICH COMPRISES CHLORINE BLEACHING A KRAFT PULP, ALKALI EXTRACTING SAID CHLORINE BLEACHED PULP, BLEACHING THE RESULTING PULP WITH AN ALKALINE HYPOCHLORITE BLEACH TO PROVIDE A PULP OF PH 9.5=1.0 PH UNIT AND CONTAINING A RESIDUAL CHLORINE CONTENT OF FROM 10 TO 35% OF THE AMOUNT OF THE AVAILABLE CHLORINE FROM THE ALKALINE HYPOCHLORITE, ACIDIFYING THE RESULTING
Claim 2
Dependent Claim
69 words
A PROCESS FOR PRODUCING A KRAFT PULP OF IMPROVED BRIGHTNESS STABILITY AND STRENGTH WHICH COMPRISES CHLORINE BLEACHING A KRAFT PULP, ALKALI EXTRACTING SAID CHLORINE BLEACHED PULP, BLEACHING THE RESULTING PULP WITH AN ALKALINE HYPOCHLORITE BLEACH TO PROVIDE A PULP OF PH 9.5=1.0 PH UNIT AND CONTAINING A RESIDUAL CHLORINE CONTENT OF FROM 10 TO 35% OF THE AMOUNT OF THE AVAILABLE CHLORINE FROM THE ALKALINE HYPOCHLORITE, ACIDIFYING THE RESULTING
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |