US3148177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of spent sulfite liquor
Assignee: Sulphite Products Corp
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Filing: 1961-07-24
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Granted: 1964-09-08
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Expires: 1981-07-24
Abstract
No abstract record available.
Inventors
- 👤 Averill J Wiley
- 👤 Benko Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:42
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PRESS FOR TREATING SPENT SULFITE LIQUOR, WHICH PROCESS COMPRISES TREATING A SPENT SULFITE LIQUOR TO REMOVE AT LEAST ABOUT 30 PERCENT OF THE PULPING BASE IONS PRESENT THEREIN, THEREBY PROVIDING IN THE SPENT SULFITE LIQUOR A SUBSTANTIAL CONCENTRATION OF FREE LIGNOSULFONIC ACIDS, CONCENTRATING SAID LIQUOR TO PROVIDE A CONCENTRATED LIQUOR HAVING A SOLIDS CONTENT BETWEEN ABOUT 20 PERCENT AND ABOUT 45 PERCENT BY WEIGHT, AND POLYMERIZING THE LIGNOSULFONIC ACIDS PRESENT IN SAID CONCENTRATED LIQUOR BY HEATING SAID CONCENTRATED LIQUOR AT A TEMPERATURE BETWEEN ABOUT 100* C. AND 250*C., WHEREBY THE MOLECULAR WEIGHT AND THE VISCOSITY OF SAID CONCENTRATED LIQUOR ARE INCREASED.
Claim 2
Dependent Claim
102 words
A PRESS FOR TREATING SPENT SULFITE LIQUOR, WHICH PROCESS COMPRISES TREATING A SPENT SULFITE LIQUOR TO REMOVE AT LEAST ABOUT 30 PERCENT OF THE PULPING BASE IONS PRESENT THEREIN, THEREBY PROVIDING IN THE SPENT SULFITE LIQUOR A SUBSTANTIAL CONCENTRATION OF FREE LIGNOSULFONIC ACIDS, CONCENTRATING SAID LIQUOR TO PROVIDE A CONCENTRATED LIQUOR HAVING A SOLIDS CONTENT BETWEEN ABOUT 20 PERCENT AND ABOUT 45 PERCENT BY WEIGHT, AND POLYMERIZING THE LIGNOSULFONIC ACIDS PRESENT IN SAID CONCENTRATED LIQUOR BY HEATING SAID CONCENTRATED LIQUOR AT A TEMPERATURE BETWEEN ABOUT 100* C. AND 250*C., WHEREBY THE MOLECULAR WEIGHT AND THE VISCOSITY OF SAID CONCENTRATED LIQUOR ARE INCREASED.
References Cited (Backward Citations)
US1948858A
Cited
US3025235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |