US3174313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment tower for paper pulp
Assignee: Dorr Oliver Inc
•
Filing: 1960-02-02
•
Granted: 1965-03-23
•
Expires: 1980-02-02
Abstract
No abstract record available.
Inventors
- 👤 Hartzell L Crosby
- 👤 Rudolf F Kozich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:05
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
PULP TREATING APPARATUS COMPRISING AN UPFLOW PULP TREATMENT TOWER HAVING AN UPPER OPEN END; AND PULP DELIVERY MECHANISM MOUNTED AT THE TOP OF SAID TOWER, COMPRISING A VERTICAL SHAFT MEMBER, MEANS FOR SUPPORTING SAID SHAFT MEMBER AT THE UPPER PORTION THEREOF FOR ROTATION ABOUT THE VERTICAL AXIS, PULP SPREADER MEANS CONNECTED TO THE FREE LOWER PORTION OF SAID SHAFT MEMBER FOR ENGAGING THE TOP STRATA OF PULP IN SAID UPFLOW TREATMENT TOWER MEANS AND EFFECTIVE TO DELIVER THE PULP FROM THE TOP END OF THE TOWER WHEN SAID SHAFT MEMBER IS ROTATED; MEANS FOR ROTATING SAID SHAFT MEMBER; AND EXTENSION MEANS ROTATING WITH SAID SHAFT MEMBER CO-AXIALLY THEREWITH AND DIRECTED DOWNWARDLY FROM THE HORIZONTAL ZONE OF PULP ENGAGEMENT OF SAID SPREADER MEANS INTO THE MASS OF PULP BELOW AND EFFECTIVE THEREIN TO STABILIZE SAID FREE LOWER PORTION OF THE SHAFT MEMBER INCIDENT TO ITS ROTATION.
Claim 2
Dependent Claim
145 words
PULP TREATING APPARATUS COMPRISING AN UPFLOW PULP TREATMENT TOWER HAVING AN UPPER OPEN END; AND PULP DELIVERY MECHANISM MOUNTED AT THE TOP OF SAID TOWER, COMPRISING A VERTICAL SHAFT MEMBER, MEANS FOR SUPPORTING SAID SHAFT MEMBER AT THE UPPER PORTION THEREOF FOR ROTATION ABOUT THE VERTICAL AXIS, PULP SPREADER MEANS CONNECTED TO THE FREE LOWER PORTION OF SAID SHAFT MEMBER FOR ENGAGING THE TOP STRATA OF PULP IN SAID UPFLOW TREATMENT TOWER MEANS AND EFFECTIVE TO DELIVER THE PULP FROM THE TOP END OF THE TOWER WHEN SAID SHAFT MEMBER IS ROTATED; MEANS FOR ROTATING SAID SHAFT MEMBER; AND EXTENSION MEANS ROTATING WITH SAID SHAFT MEMBER CO-AXIALLY THEREWITH AND DIRECTED DOWNWARDLY FROM THE HORIZONTAL ZONE OF PULP ENGAGEMENT OF SAID SPREADER MEANS INTO THE MASS OF PULP BELOW AND EFFECTIVE THEREIN TO STABILIZE SAID FREE LOWER PORTION OF THE SHAFT MEMBER INCIDENT TO ITS ROTATION.
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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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |