Patent US3114309A successfully refreshed from Google Patents.
US3114309A
Expired / Lapsed
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Centrifugal thickener for paper pulp
Assignee: Canadian Ingersoll Rand Co Ltd
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Filing: 1962-01-24
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Granted: 1963-12-17
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Expires: 1982-01-24
Abstract
No abstract record available.
Inventors
- 👤 Anton J Hang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:04
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/18; D21D; D21D5/00; D21D5/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
149 words
IN A METHOD OF THICKENING A DILUTE FIBROUS MASS WHICH INCLUDES WATER, SLIMY AND GELATINOUS MATERIAL AND PULP FIBERS, THE STEPS WHICH INCLUDE: (A) INTRODUCING THE FIBROUS MASS INTO A REVOLVING SCREEN DRUM HAVING A MULTIPLICITY OF DRAIN OPENINGS, (B) MOVING THE MASS OF PULP FIBERS, SLIMY AND GELATINOUS MATERIAL AND WATER ALONG A CIRCULAR PATH OF TRAVEL IN ONE DIRECTION AND SUBJECTING THE MASS TO CENTRIFUGAL FORCES TO EXPEL A PART OF THE WATER IN THE MASS THROUGH THE DRAIN OPENINGS OF THE REVOLVING SCREEN DRUM, (C) APPLYING ROLLING PRESSURE TO THE PARTLY DEWATERED MASS AS IT CONTINUES ALONG THE SAID CIRCULAR PATH OF TRAVEL TO REMOVE ANOTHER PORTION OF THE WATER AND TO CAUSE THE FIBERS AND SLIMY AND GELATINOUS MATERIAL TO ADHERE TOGETHER IN A COMPRESSED CYLINDRICAL LAYER WHICH IS HELD AGAINST THE INNER PERIPHERAL SURFACE OF THE REVOLVING SCREEN DRUM BY THE SAID CENTRIFUGAL FORCES,
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) | 1966-12-16 | 1967-06-17 | 1967-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-16 | 1971-06-17 | 1971-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-16 | 1975-06-17 | 1975-12-17 | $7700.00 | Window Closed / Lapsed |