US2707146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching mechanically disintegrated wood pulp
Assignee: Kimberly Clark Tissue Co
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Filing: 1951-08-08
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Granted: 1955-04-26
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Expires: 1971-08-08
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:43
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
THE METHOD OF BLEACHING MECHANICALLY-DISINTEGRATED WOOD PULP WHICH COMPRISES CONTINUOUSLY FEEDING A WATER-SOLUBLE HYDROSULPHITE AND A WATER-SOLUBLE POLYPHOSPHATE, IN AQUEOUS SOLUTION SUBSTANTIALLY FREE OF ENTRAINED AIR, INTO A CONTINUOUSLY-MOVING STREAM OF MECHANICALLY-DISINTEGRATED WOOD PULP, SUBSTANTIALLY FREE OF ENTRAINED AIR, THE SAID POLYPHOSPHATE BEINGFED TO SAID PULP AT A POINT NOT SUBSTANTIALLY LATER THAN THAT AT WHICH THE HYDROSULPHITE IS FED TO SAID PULP WHEREBY THE HYDROSULPHITE AND POLYPHOSPHATE ARE IN ADMIXTURE WITH SAID WOOD PULP DURING BLEACHING; SUBJECTING SAID PULP, HY DROSULPHITE AND POLYPHOSPHATE TO COMBINED VIGOROUS AGITATION, WHEREBY THE HYDROSULPHITE AND POLYPHOSPHATE ARE RAPIDLY AND INTIMATELY MIXED WITH SAID PULP, AND PROPULSION; FORCING, BY MEANS OF SAID PROPULSION, SAID INTIMATE MIXTURE COMPRISING SAID PULP, HYDROSULPHITE AND POLYPHOSPHATE AS A CONTINUOUSLY-MOVING STREAM CHARACTERIZED BY STREAMLINE, PLUG FLOW ALONG A CONFINED, AIRTIGHT PATH COMPRISING A VERTICAL FLUID WAY, UNTIL THE DESIRED BLEACHING TAKES PLACE.
Claim 2
Independent Claim
143 words
THE METHOD OF BLEACHING MECHANICALLY-DISINTEGRATED WOOD PULP WHICH COMPRISES CONTINUOUSLY FEEDING A WATER-SOLUBLE HYDROSULPHITE AND A WATER-SOLUBLE POLYPHOSPHATE, IN AQUEOUS SOLUTION SUBSTANTIALLY FREE OF ENTRAINED AIR, INTO A CONTINUOUSLY-MOVING STREAM OF MECHANICALLY-DISINTEGRATED WOOD PULP, SUBSTANTIALLY FREE OF ENTRAINED AIR, THE SAID POLYPHOSPHATE BEINGFED TO SAID PULP AT A POINT NOT SUBSTANTIALLY LATER THAN THAT AT WHICH THE HYDROSULPHITE IS FED TO SAID PULP WHEREBY THE HYDROSULPHITE AND POLYPHOSPHATE ARE IN ADMIXTURE WITH SAID WOOD PULP DURING BLEACHING; SUBJECTING SAID PULP, HY DROSULPHITE AND POLYPHOSPHATE TO COMBINED VIGOROUS AGITATION, WHEREBY THE HYDROSULPHITE AND POLYPHOSPHATE ARE RAPIDLY AND INTIMATELY MIXED WITH SAID PULP, AND PROPULSION; FORCING, BY MEANS OF SAID PROPULSION, SAID INTIMATE MIXTURE COMPRISING SAID PULP, HYDROSULPHITE AND POLYPHOSPHATE AS A CONTINUOUSLY-MOVING STREAM CHARACTERIZED BY STREAMLINE, PLUG FLOW ALONG A CONFINED, AIRTIGHT PATH COMPRISING A VERTICAL FLUID WAY, UNTIL THE DESIRED BLEACHING TAKES PLACE.
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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) | 1958-04-25 | 1958-10-25 | 1959-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-25 | 1962-10-25 | 1963-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-25 | 1966-10-25 | 1967-04-26 | $7700.00 | Window Closed / Lapsed |