US2513344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching high-density pulp
Assignee: BUFFALO ELECTRO CHEM CO
•
Filing: 1946-09-19
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Granted: 1950-07-04
•
Expires: 1966-09-19
Abstract
No abstract record available.
Inventors
- 👤 Robert L Mcewen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:51
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF BLEACHING WOOD PULP CONTAINING GROUND WOOD FIBERS WHICH COMPRISES PREPARING A WET LAP FROM THE PULP, SAID LAP CONTAINING MORE THAN 15% FIBERS, WETTING THE LAP WITH SUFFICIENT ALKALINE PEROXIDE BLEACHING SOLUTION TO REDUCE THE PULP CONSISTENCY AT LEAST BY 1%, DISINTEGRATING THE LAP SUBSTANTIALLY IMMEDIATELY THEREAFTER, AND PERMITTING THE FIBERS OF THE DISINTEGRATED LAP TO BLEACH IN THE DAMP CONDITION, THEN LOWERING THE CONSISTENCY OF THE PULP FOR USE IN PAPER MAKING.
Claim 2
Independent Claim
76 words
THE METHOD OF BLEACHING WOOD PULP CONTAINING GROUND WOOD FIBERS WHICH COMPRISES PREPARING A WET LAP FROM THE PULP, SAID LAP CONTAINING MORE THAN 15% FIBERS, WETTING THE LAP WITH SUFFICIENT ALKALINE PEROXIDE BLEACHING SOLUTION TO REDUCE THE PULP CONSISTENCY AT LEAST BY 1%, DISINTEGRATING THE LAP SUBSTANTIALLY IMMEDIATELY THEREAFTER, AND PERMITTING THE FIBERS OF THE DISINTEGRATED LAP TO BLEACH IN THE DAMP CONDITION, THEN LOWERING THE CONSISTENCY OF THE PULP FOR USE IN PAPER MAKING.
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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) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |