US2623040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coagulating colloidal lignates in aqueous dispersions
Assignee: West Virginia Pulp and Paper Co
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Filing: 1950-07-06
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Granted: 1952-12-23
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Expires: 1970-07-06
Abstract
No abstract record available.
Inventors
- 👤 Jr John J Keilen
- 👤 Frank J Ball
- 👤 Robert W Gressang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:03
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE METHOD OF COAGULATING COLLOIDAL LIGNATES RESULTING FROM THE ACID PRECIPITATION THEREOF IN BLACK LIQUOR WHICH COMPRISES PASSING A STREAM OF THE SO ACIDULATED BLACK LIQUOR THROUGH A TUBULAR ZONE WHILE SAID STREAM IS MAINTAINED AT A TEMPERATURE IN EXCESS OF 170* F. AND UNDER A PRESSURE IN EXCESS OF THE VAPOR PRESSURE CORRESPONDING TO SUCH TEMPERATURE AND CONTROLLING THE PARTICLE SIZE OF THE COAGULATED LIGNATE BY MAINTAINING SAID LIQUOR UNDER AGITATION CORRESPONDING TO A REYNOLDS NUMBER NOT SUBSTANTIALLY IN EXCESS OF 2100, THEN WHILE SAID LIQUOR IS STILL IN MOTION COOLING THE SAME TO PREVENT FUSION OF THE LIGNATE PARTICLES, AND FILTERING THE COAGULATED LIGNATE PARTICLES FROM THE BLACK LIQUOR.
Claim 2
Independent Claim
111 words
THE METHOD OF COAGULATING COLLOIDAL LIGNATES RESULTING FROM THE ACID PRECIPITATION THEREOF IN BLACK LIQUOR WHICH COMPRISES PASSING A STREAM OF THE SO ACIDULATED BLACK LIQUOR THROUGH A TUBULAR ZONE WHILE SAID STREAM IS MAINTAINED AT A TEMPERATURE IN EXCESS OF 170* F. AND UNDER A PRESSURE IN EXCESS OF THE VAPOR PRESSURE CORRESPONDING TO SUCH TEMPERATURE AND CONTROLLING THE PARTICLE SIZE OF THE COAGULATED LIGNATE BY MAINTAINING SAID LIQUOR UNDER AGITATION CORRESPONDING TO A REYNOLDS NUMBER NOT SUBSTANTIALLY IN EXCESS OF 2100, THEN WHILE SAID LIQUOR IS STILL IN MOTION COOLING THE SAME TO PREVENT FUSION OF THE LIGNATE PARTICLES, AND FILTERING THE COAGULATED LIGNATE PARTICLES FROM THE BLACK LIQUOR.
References Cited (Backward Citations)
US2406867A
Cited
FR2012125A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |