US3219187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the classification of finely divided materials
Assignee: Metso Fiber Karlstad AB
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Filing: 1962-06-15
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Granted: 1965-11-23
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Expires: 1982-06-15
Abstract
No abstract record available.
Inventors
- 👤 Ritze Rolf Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:01
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/12; B07B1/14; B07B1/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
APPARATUS FOR THE CLASSIFICATION OF MATERIALS HAVING A PERVIOUS BOTTOM CONSTITUTED BY A PLURALITY OF ROLLS PARALLEL TO AND ARRANGED ALONGSIDE EACH OTHER AND ROTATABLE AT THE SAME SPEED AND IN THE SAME DIRECTION OF ROTATION, EACH OF THE ROLLS HAVING AT LEAST ONE HELICAL GROOVE IN ITS PERIPHERY MAKING SEVERAL CONTINUOUS TURNS AROUND THE ROLL, CONSECUTIVE TURNS MAKING A RESULTANT AXIAL ADVANCEMENT IN ONE AND THE SAME DIRECTION WHEREIN EACH TURN OF SAID GROOVE HAS A PORTION WITH RESPECT TO THE LONGITUDINAL AXIS OF THE ROLL WITH A GREATER INCLINATION IN ONE DIRECTION AND A PORTION WITH A SMALLER INCLINATION IN THE OPPOSITE DIRECTION WHEREBY EACH SAID GROOVE ALTERNATELY PROGRESSES AND REGRESSES ALONG THE AXIS OF ITS ROLL.
Claim 2
Dependent Claim
119 words
APPARATUS FOR THE CLASSIFICATION OF MATERIALS HAVING A PERVIOUS BOTTOM CONSTITUTED BY A PLURALITY OF ROLLS PARALLEL TO AND ARRANGED ALONGSIDE EACH OTHER AND ROTATABLE AT THE SAME SPEED AND IN THE SAME DIRECTION OF ROTATION, EACH OF THE ROLLS HAVING AT LEAST ONE HELICAL GROOVE IN ITS PERIPHERY MAKING SEVERAL CONTINUOUS TURNS AROUND THE ROLL, CONSECUTIVE TURNS MAKING A RESULTANT AXIAL ADVANCEMENT IN ONE AND THE SAME DIRECTION WHEREIN EACH TURN OF SAID GROOVE HAS A PORTION WITH RESPECT TO THE LONGITUDINAL AXIS OF THE ROLL WITH A GREATER INCLINATION IN ONE DIRECTION AND A PORTION WITH A SMALLER INCLINATION IN THE OPPOSITE DIRECTION WHEREBY EACH SAID GROOVE ALTERNATELY PROGRESSES AND REGRESSES ALONG THE AXIS OF ITS ROLL.
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |