US2510595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching groundwood
Assignee: BUFFALO ELECTRO CHEM CO
•
Filing: 1946-09-20
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Granted: 1950-06-06
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Expires: 1966-09-20
Abstract
No abstract record available.
Inventors
- 👤 Robert L Mcewen
- 👤 Fred R Sheldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:17
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF BLEACHING GROUND WOOD FIBERS WHICH COMPRISES FELTING THE FIBERS INTO A WEB FROM A WATER SUSPENSION CONTAINING SUCH FIBERS, DEWATERING THE WEB TO A WATER CONTENT OF LESS THAN ABOUT 250% ON AN OVEN DRY PULP BASIS WHEREBY THE WEB IS SELF-SUSTAINING AND THEREAFTER APPLYING TO AT LEAST ONE FACE OF THE PULP WEB SUFFICIENT OF AN AQUEOUS ALKALINE BLEACHING SOLUTION TO PRODUCE THE DESIRED DEGREE OF BLEACH IN THE WEB, SAID SOLUTION CONSISTING OF HYDROGEN PEROXIDE AND A SOLUBLE PHOSPHATE OF AN ALKALI METAL AS THE ESSENTIAL INGREDIENTS, THE LATTER COMPOUND PRODUCING A PH THEREIN IN THE RANGE PH 9.5 TO 11.5.
Claim 2
Independent Claim
106 words
THE METHOD OF BLEACHING GROUND WOOD FIBERS WHICH COMPRISES FELTING THE FIBERS INTO A WEB FROM A WATER SUSPENSION CONTAINING SUCH FIBERS, DEWATERING THE WEB TO A WATER CONTENT OF LESS THAN ABOUT 250% ON AN OVEN DRY PULP BASIS WHEREBY THE WEB IS SELF-SUSTAINING AND THEREAFTER APPLYING TO AT LEAST ONE FACE OF THE PULP WEB SUFFICIENT OF AN AQUEOUS ALKALINE BLEACHING SOLUTION TO PRODUCE THE DESIRED DEGREE OF BLEACH IN THE WEB, SAID SOLUTION CONSISTING OF HYDROGEN PEROXIDE AND A SOLUBLE PHOSPHATE OF AN ALKALI METAL AS THE ESSENTIAL INGREDIENTS, THE LATTER COMPOUND PRODUCING A PH THEREIN IN THE RANGE PH 9.5 TO 11.5.
References Cited (Backward Citations)
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Cited
US2107297A
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AU2163135A
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US2125634A
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US2150926A
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US2191431A
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US2435566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-05 | 1953-12-05 | 1954-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-05 | 1957-12-05 | 1958-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-05 | 1961-12-05 | 1962-06-06 | $7700.00 | Window Closed / Lapsed |