Patent US1785772A successfully refreshed from Google Patents.
Patent US2744012A successfully refreshed from Google Patents.
US2744012A
Expired / Lapsed
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Pulping apparatus
Assignee: Valmet AB
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Filing: 1953-04-13
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Granted: 1956-05-01
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Bylund Alvar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:31
CPC Classifications
D; D21; D21C; D21C7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN AN APPARATUS FOR PRODUCING PULP COMPRISING A CLOSED SYSTEM DEFINING A PATH OF FLOW FOR THE MATERIAL TO BE TREATED, A FEEDING DEVICE FOR INTRODUCING MATERIAL INTO SAID PATH OF FLOW, ABRADING MEANS FOR THE MATERIAL INTERPOSED IN SAID PATH OF FLOW AND A DISCHAGE DEVICE FOR REMOVING THE TREATED MATERIAL FROM SAID PATH OF FLOW; MEANS FOR SUBJECTING THE RAW MATERIAL TO A PROLONGED TREATMENT IN THE COURSE OF FLOW FROM SAID FEEDING DEVICE TO SAID ABRADING MEANS, SAID MEANS COMPRISING A SERIES OF INTERCONNECTED OPPOSITELY INCLINED TUBES WITH THERIR AXIS OF INCLINATION IN A SUBSTANTIALLY HORIZONTAL PLANE, THE LOWER END OF THE FIRST ONE OF SAID TUBES BEING CONNECTED TO SAID FEEDING DEVICE AND THE UPPER END OF THE LAST ONE OF
Claim 2
Dependent Claim
125 words
IN AN APPARATUS FOR PRODUCING PULP COMPRISING A CLOSED SYSTEM DEFINING A PATH OF FLOW FOR THE MATERIAL TO BE TREATED, A FEEDING DEVICE FOR INTRODUCING MATERIAL INTO SAID PATH OF FLOW, ABRADING MEANS FOR THE MATERIAL INTERPOSED IN SAID PATH OF FLOW AND A DISCHAGE DEVICE FOR REMOVING THE TREATED MATERIAL FROM SAID PATH OF FLOW; MEANS FOR SUBJECTING THE RAW MATERIAL TO A PROLONGED TREATMENT IN THE COURSE OF FLOW FROM SAID FEEDING DEVICE TO SAID ABRADING MEANS, SAID MEANS COMPRISING A SERIES OF INTERCONNECTED OPPOSITELY INCLINED TUBES WITH THERIR AXIS OF INCLINATION IN A SUBSTANTIALLY HORIZONTAL PLANE, THE LOWER END OF THE FIRST ONE OF SAID TUBES BEING CONNECTED TO SAID FEEDING DEVICE AND THE UPPER END OF THE LAST ONE OF
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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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |