US2707145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching mechanically disintegrated wood pulp
Assignee: Kimberly Clark Tissue Co
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Filing: 1952-09-11
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Granted: 1955-04-26
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Expires: 1972-09-11
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 20:14
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
78 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 COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE DIAMINE TETRA ACETIC ACID AND THE ALKALI METAL, ALKALINE EARTH METAL AND AMMONIUM SALTS THEREOF, WHEREBY THE HYDROSULPHITE AND COMPOUND ARE IN ADMIXTURE WITH SAID WOOD PULP DURING BLEACHING.
Claim 2
Dependent Claim
78 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 COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE DIAMINE TETRA ACETIC ACID AND THE ALKALI METAL, ALKALINE EARTH METAL AND AMMONIUM SALTS THEREOF, WHEREBY THE HYDROSULPHITE AND COMPOUND ARE IN ADMIXTURE WITH SAID WOOD PULP DURING BLEACHING.
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) | 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 |