US3745065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of chlorine dioxide bleaching
Assignee: CONS PAPER Inc
•
Filing: 1971-09-07
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Granted: 1973-07-10
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Expires: 1991-09-07
Abstract
Abstract BLEACHING OF CELLULOSIC MATERIALS WITH CHLORINE DIOXIDE IN A CONVENTIONAL BLEACHING TOWER WHILE MAINTAINING THE TEMPERATURE AND MASS FLOW RATE OF INCOMING PULP SUBSTANTIALLY CONSTANT IS CONTROLLED BY CONTINUOUSLY MEASURING THE CONCENTRATION OF RESIDUAL GASEOUS CHLORINE DIOXIDE IN THE HEAD SPACE OF THE TOWER AND ADJUSTING THE INPUT OF CHLORINE DIOXIDE TO ACHIEVE A RESIDUAL LEVEL CORRELATED TO THE DESIRED DEGREE OF BRIGHTNESS.
Inventors
- 👤 Rama J Niilo
- 👤 D Whitley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:54
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; D21C9/1052; Y; Y10; Y10S; Y10S162/00; Y10S162/09; Y10S162/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |