US2853495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2, 4-monofurfurylidene sorbitol
Assignee: Individual
•
Filing: 1954-06-04
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Granted: 1958-09-23
•
Expires: 1974-06-04
Abstract
No abstract record available.
Inventors
- 👤 Simon L Ruskin
- 👤 Robert C Hockett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:14
CPC Classifications
C; C07; C07C; C07C255/00; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/62; C07H; C07H19/00; C07H19/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A PROCESS OF MAKING CRYSTALLINE 2,4-MONOFURFURYLIDENE SORBITOL, COMPRISING THE STEPS OF REACTING SORBITOL WITH FURFURAL IN THE PRESENCE OF SULFURIC ACID TO FORM 2,4-MONOFURFURYLIDENE SORBITOL IN A MOTHER LIQUOR CONTAINING SULFURIC ACID AND UNREACTED FURFURAL, CRYSTALLIZING THE 2,4-MONOFURFURYLIDENE SORBITOL TO FORM A MIXTURE OF CRYSTALS AND MOTHER LIQUOR, MECHANICALLY SEPARATING THE CRYSTALS AND THE MOTHER LIQUOR, WASHING THE CRYSTALS WITH AN INERT LIQUID SOLVENT FOR THE SULFURIC ACID AND FURFURAL AND IN WHICH THE 2,4-MONOFURFURYLIDENE SORBITOL IS INSOLUBLE, REPEATING THE WASHING AS NECESSARY UNTIL SAID CRYSTALS ARE SUBSTANTIALLY FREE FROM FURFURAL, THEN WASHING THE CRYSTALS WITH A BASIC WASH LIQUID TO NEUTRALIZE THE SULFURIC ACID, AND MECHANICALLY SEPARATING THE CRYSTALS FROM THE WASH LIQUID THEREBY RECOVERING CRYSTALLINE 2,4MONOFURFURYLIDENE SORBITOL FREE FROM RESIDUAL SULFURIC ACID AND FREE FROM DARK, CONTAMINATING FURFURAL DERIVATIVES.
Claim 2
Dependent Claim
131 words
A PROCESS OF MAKING CRYSTALLINE 2,4-MONOFURFURYLIDENE SORBITOL, COMPRISING THE STEPS OF REACTING SORBITOL WITH FURFURAL IN THE PRESENCE OF SULFURIC ACID TO FORM 2,4-MONOFURFURYLIDENE SORBITOL IN A MOTHER LIQUOR CONTAINING SULFURIC ACID AND UNREACTED FURFURAL, CRYSTALLIZING THE 2,4-MONOFURFURYLIDENE SORBITOL TO FORM A MIXTURE OF CRYSTALS AND MOTHER LIQUOR, MECHANICALLY SEPARATING THE CRYSTALS AND THE MOTHER LIQUOR, WASHING THE CRYSTALS WITH AN INERT LIQUID SOLVENT FOR THE SULFURIC ACID AND FURFURAL AND IN WHICH THE 2,4-MONOFURFURYLIDENE SORBITOL IS INSOLUBLE, REPEATING THE WASHING AS NECESSARY UNTIL SAID CRYSTALS ARE SUBSTANTIALLY FREE FROM FURFURAL, THEN WASHING THE CRYSTALS WITH A BASIC WASH LIQUID TO NEUTRALIZE THE SULFURIC ACID, AND MECHANICALLY SEPARATING THE CRYSTALS FROM THE WASH LIQUID THEREBY RECOVERING CRYSTALLINE 2,4MONOFURFURYLIDENE SORBITOL FREE FROM RESIDUAL SULFURIC ACID AND FREE FROM DARK, CONTAMINATING FURFURAL DERIVATIVES.
References Cited (Backward Citations)
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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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |