Patent US3037901A successfully refreshed from Google Patents.
US3037901A
Expired / Lapsed
US
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Method of pulping cellulosic substances
Assignee: Individual
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Filing: 1959-04-16
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Granted: 1962-06-05
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Expires: 1979-04-16
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:54
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/04; D21C3/06; D21C3/14; D21C11/00; D21C11/12; D21C11/125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF PULPING CELLULOSIC MATERIAL WITH A COOKING LIQUOR THAT CONSISTS ESSENTIALLY OF NORMAL AMMONIUM SULPHITE WHICH COMPRISES; COMMINGLING SAID CELLUOSIC MATERIAL WITH A SOLUTION OF AMMONIUM SULPHITE AND DIGESTING SAME AT THE APPROXIMATE TEMPERATURE 375* F. UNTIL SAID MATERIAL SHALL CONSIST ESSENTIALLY OF CELLULOSE FIBERS AND SPENT COOKING LIQUOR; SEPARATING SAID CELLULOSE FROM SAID SPENT COOKING LIQUOR; EVAPORATING THE COOKING LIQUOR AND ABSORBING THE CONCENTRATED MATERIAL IN A PREFORMED RECYCLED SPENT LIQUOR COKE; CARBONIZING THE RESULTANT LIQUOR-SATURATED COKE TO OBTAIN COKE FOR RECYCLING, COKE AS AN ACCEPTED PRODUCT, AND VOLATILE SUBSTANCES; CONDENSING SAID VOLATILES TO PRODUCE LIQUID AND GASEOUS PRODUCTS; SEPARATING SAID LIQUID PRODUCTS INTO A SOLUTION OF AMMONIUM SALTS AND METHOXYL DEGRADATION PRODUCTS; AND RECYCLING SAID SOLUTION OF AMMONIUM SALTS AS A REGENERATED COOKING LIQUOR.
Claim 2
Independent Claim
128 words
THE METHOD OF PULPING CELLULOSIC MATERIAL WITH A COOKING LIQUOR THAT CONSISTS ESSENTIALLY OF NORMAL AMMONIUM SULPHITE WHICH COMPRISES; COMMINGLING SAID CELLUOSIC MATERIAL WITH A SOLUTION OF AMMONIUM SULPHITE AND DIGESTING SAME AT THE APPROXIMATE TEMPERATURE 375* F. UNTIL SAID MATERIAL SHALL CONSIST ESSENTIALLY OF CELLULOSE FIBERS AND SPENT COOKING LIQUOR; SEPARATING SAID CELLULOSE FROM SAID SPENT COOKING LIQUOR; EVAPORATING THE COOKING LIQUOR AND ABSORBING THE CONCENTRATED MATERIAL IN A PREFORMED RECYCLED SPENT LIQUOR COKE; CARBONIZING THE RESULTANT LIQUOR-SATURATED COKE TO OBTAIN COKE FOR RECYCLING, COKE AS AN ACCEPTED PRODUCT, AND VOLATILE SUBSTANCES; CONDENSING SAID VOLATILES TO PRODUCE LIQUID AND GASEOUS PRODUCTS; SEPARATING SAID LIQUID PRODUCTS INTO A SOLUTION OF AMMONIUM SALTS AND METHOXYL DEGRADATION PRODUCTS; AND RECYCLING SAID SOLUTION OF AMMONIUM SALTS AS A REGENERATED COOKING LIQUOR.
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) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |