US2707144A
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
- 👤 Donald B Sparrow
- 👤 James J Eberl
- 👤 Kenneth W Britt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:20
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; D21C9/1042; Y; Y10; Y10S; Y10S424/00; Y10S424/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN THE BLEACHING OF MECHANICALLY-DISINTEGRATED WOOD PULP BY THE USE OF A WATER-SOLUBLE HYDROSULPHITE, THE IMPROVEMENT WHICH COMPRISES MIXING WITH SAID WOOD PULP, AT A TIME NOT SUBSTANTIALLY LATER THAN THAT AT WHICH THE HYDROSULPHITE IS MIXED WITH THE PULP, A WATER-SOLUBLE POLYPHOSPHATE, WHEREBY THE HYDROSULPHITE AND POLYPHOSPHATE ARE IN ADMIXING WITH SAID WOOD PULP DURING BLEACHING.
Claim 2
Dependent Claim
57 words
IN THE BLEACHING OF MECHANICALLY-DISINTEGRATED WOOD PULP BY THE USE OF A WATER-SOLUBLE HYDROSULPHITE, THE IMPROVEMENT WHICH COMPRISES MIXING WITH SAID WOOD PULP, AT A TIME NOT SUBSTANTIALLY LATER THAN THAT AT WHICH THE HYDROSULPHITE IS MIXED WITH THE PULP, A WATER-SOLUBLE POLYPHOSPHATE, WHEREBY THE HYDROSULPHITE AND POLYPHOSPHATE ARE IN ADMIXING WITH SAID WOOD PULP DURING BLEACHING.
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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 |