US2510668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of converting woody substances
Assignee: Individual
•
Filing: 1945-10-08
•
Granted: 1950-06-06
•
Expires: 1965-10-08
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:17
CPC Classifications
C; C13; C13K; C13K1/00; C13K1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
THE METHOD OF SACCHARLFYING CELLULOSE TO OBTAIN A MEDIUM SUITABLE FOR YEAST CULTURE WHICH COMPRISES; COMMINGLING A PURIFIED FORM OF CELLULOSE, OBTAINED BY A PRELIMINARY DIGESTION OF WOODY SUBSTANCES WITH A WATER SOLUTION OF ALKALI METAL HYDROXIDE AND SEPARATION OF THE SOLUBLE PRODUCTS THUS OBTAINED, WITH WATER IN SUCH PROPORTION AS SHALL PRODUCE A MAGMA OF MOBILE CONSISTENCY; HEATING SAID MAGMA BY THE DIRECT ADMISSION OF STEAM WHILE IN A STATE OF FLOW TO SACCHARIFYING TEMPERATURES, BEING FROM 100* TO 180* C. UNDER SUPERATMOSPHERIC PRESSURE; ACIDIFYING SAID MAGMA AND MAINTIANING SAME UNDER SAID SACCHARIFYING TEMPERATURE UNTIL A PREDETERMINED BUT PARTIAL DEGREE OF CONVERSION HAS BEEN REACHED; NEUTRIALIZING THE ACIDITY OF SAID MAGMA; RELEASING THE PRESSURE WITH CONSEQUENT EVOLUTION OF RELIEF STEAM; SEPARATING THE SUGAR SOLUTION FROM THE UNCONVERTED CELLULOSE; AND RETURNING THE UNCONVERTED CELLULOSE TO THE INITIAL STEP OF THE PROCESS.
Claim 2
Independent Claim
141 words
THE METHOD OF SACCHARLFYING CELLULOSE TO OBTAIN A MEDIUM SUITABLE FOR YEAST CULTURE WHICH COMPRISES; COMMINGLING A PURIFIED FORM OF CELLULOSE, OBTAINED BY A PRELIMINARY DIGESTION OF WOODY SUBSTANCES WITH A WATER SOLUTION OF ALKALI METAL HYDROXIDE AND SEPARATION OF THE SOLUBLE PRODUCTS THUS OBTAINED, WITH WATER IN SUCH PROPORTION AS SHALL PRODUCE A MAGMA OF MOBILE CONSISTENCY; HEATING SAID MAGMA BY THE DIRECT ADMISSION OF STEAM WHILE IN A STATE OF FLOW TO SACCHARIFYING TEMPERATURES, BEING FROM 100* TO 180* C. UNDER SUPERATMOSPHERIC PRESSURE; ACIDIFYING SAID MAGMA AND MAINTIANING SAME UNDER SAID SACCHARIFYING TEMPERATURE UNTIL A PREDETERMINED BUT PARTIAL DEGREE OF CONVERSION HAS BEEN REACHED; NEUTRIALIZING THE ACIDITY OF SAID MAGMA; RELEASING THE PRESSURE WITH CONSEQUENT EVOLUTION OF RELIEF STEAM; SEPARATING THE SUGAR SOLUTION FROM THE UNCONVERTED CELLULOSE; AND RETURNING THE UNCONVERTED CELLULOSE TO THE INITIAL STEP OF THE PROCESS.
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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) | 1953-06-05 | 1953-12-05 | 1954-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-05 | 1957-12-05 | 1958-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-05 | 1961-12-05 | 1962-06-06 | $7700.00 | Window Closed / Lapsed |