US3575795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid high consistency bleaching with continuous diffusion
Assignee: International Paper Co
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Filing: 1967-08-14
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Granted: 1971-04-20
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Expires: 1987-08-14
Abstract
Abstract A METHOD OF RAPID BLEACHING OF CELLULOSIC MATERIAL, SUCH AS WOOD PULP, IS PROVIDED WHEREIN A HIGH CONSISTENCY LIQUID SUSPENSION OF CELLULOSIC MATERIAL IS INTRODUCED INTO A VESSEL, A BLEACHING SOLUTION IS INTRODUCED INTO SAID LIQUID SUSPENSION THROUGH A PLURALITY OF INLET DUCTS, MOVED RAPIDLY RELATIVE TO THE CELLULOSIC MATERIAL, AND THE SUSPENSION LIQUID EXTRACTED THROUGH A PLURALITY OF EXTRACTION SCREENS.
Inventors
- 👤 Amiel W Brinkley Jr
- 👤 George G Nelson Jr
- 👤 R Terry Campbell
- 👤 Owen M Goff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:30
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/40; B01F23/43; B01F23/431; D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; D21C9/1031
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |