US2680684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strainer mechanism for use in continuous cooking of chips in the manufacture of pulp
Assignee: West Virginia Pulp and Paper Co
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Filing: 1951-12-06
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Granted: 1954-06-08
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Expires: 1971-12-06
Abstract
No abstract record available.
Inventors
- 👤 Obenshain David Noel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:59
CPC Classifications
D; D21; D21C; D21C7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A DIGESTER FOR CONTINUOUSLY COOKING WOOD CHIPS TO FORM PULP, SAID DIGESTER HAVING MEANS FOR CONTINUOUSLY DISCHARGING COOKED CHIPS THEREFROM, A STRAINER IN THE PATH OF MOVEMENT OF THE CHIPS COMPRISING A SERIES OF SPACED SUBSTANTIALLY CONCENTRIC PARTIALLY NESTED TRUNCATED FUNNEL-LIKE ELEMENTS WITH THE NARROW ENDS OF SAID ELEMENTS POINTED IN THE DIRECTION OF TRAVEL OF THE CHIPS AND INTO THE TOPS OF THE SUCCEEDING ELEMENTS, THE SURFACES BETWEEN SAID ELEMENTS IN THE REGION OF NESTING BEING SUCH AS TO PERMIT THE PASSAGE OF LIQUID THEREFROM TO THE SUBSTANTIAL EXCLUSION OF THE CHIPS, AND MEANS FOR WITHDRAWING THE SEPARATED LIQUID FROM THE DIGESTER.
Claim 2
Dependent Claim
104 words
IN A DIGESTER FOR CONTINUOUSLY COOKING WOOD CHIPS TO FORM PULP, SAID DIGESTER HAVING MEANS FOR CONTINUOUSLY DISCHARGING COOKED CHIPS THEREFROM, A STRAINER IN THE PATH OF MOVEMENT OF THE CHIPS COMPRISING A SERIES OF SPACED SUBSTANTIALLY CONCENTRIC PARTIALLY NESTED TRUNCATED FUNNEL-LIKE ELEMENTS WITH THE NARROW ENDS OF SAID ELEMENTS POINTED IN THE DIRECTION OF TRAVEL OF THE CHIPS AND INTO THE TOPS OF THE SUCCEEDING ELEMENTS, THE SURFACES BETWEEN SAID ELEMENTS IN THE REGION OF NESTING BEING SUCH AS TO PERMIT THE PASSAGE OF LIQUID THEREFROM TO THE SUBSTANTIAL EXCLUSION OF THE CHIPS, AND MEANS FOR WITHDRAWING THE SEPARATED LIQUID FROM THE DIGESTER.
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) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |