Patent US3168579A successfully refreshed from Google Patents.
US3168579A
Expired / Lapsed
US
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Production of polyols from substituted aldehydes
Assignee: Shell USA Inc
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Filing: 1960-10-14
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Granted: 1965-02-02
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Expires: 1980-10-14
Abstract
No abstract record available.
Inventors
- 👤 Jr George A Boswell
- 👤 Rupert C Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:50
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/14; C07C29/141; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A PROCESS FOR CONVERTING AN AQUEOUS SOLUTION ALPHA-HYDROXY ALIPHATIC ALDEHYDE OF 3 TO 6 CARBON ATOMS PER MOLECULE COMPOSED OF CARBON, HYDROGEN, AND HYDROXY AND ALDEHYDE OXYGEN ATOMS TO THE CORRESPONDING POLYOL IN WHICH A HYDROGENATION STEP IS CARRIED OUT IN THE PRESENCE OF A SOLID HYDROGENATION CATALYST AT ABOUT 20* TO ABOUT 300*C. UNDER HYDROGEN PRESSURE OF ABOUT 50 TO ABOUT 5000 P.S.I.G., THE IMPROVEMENT, WHEREBY THE EFFECTIVE LIFE OF THE CATALYST IS EXTENDED, OF REACTING A FRESHLY PREPARED CLEAR AQUEOUS SOLUTION OF SAID ALPHA-HYDROXYALDEHYDE BEFORE FORMATION OF UNDISSOLVED POLYMER OF SAID ALDEHYDE THEREIN, WITH AN ALIPHATIC, SATURATED UNSUBSTITUTED ALCOHOL OF 1 TO 6 CARBON ATOMS PER MOLECULE TO PRODUCE THE HEMIACETAL OF SAID ALPHA-HYDROXYALDEHYDE AND SAID ALCOHOL HAVING A SOLUBILITY IN THE HYDROGENATION MIXTURE OF AT LEAST 0.1 GRAM PER 100 GRAMS OF LIQUID MIXTURE AND CARRYING OUT THE SAID HYDROGENATION WITH THE RESULTING AQUEOUS SOLUTION OF SAID HEMIACETAL.
Claim 2
Dependent Claim
152 words
IN A PROCESS FOR CONVERTING AN AQUEOUS SOLUTION ALPHA-HYDROXY ALIPHATIC ALDEHYDE OF 3 TO 6 CARBON ATOMS PER MOLECULE COMPOSED OF CARBON, HYDROGEN, AND HYDROXY AND ALDEHYDE OXYGEN ATOMS TO THE CORRESPONDING POLYOL IN WHICH A HYDROGENATION STEP IS CARRIED OUT IN THE PRESENCE OF A SOLID HYDROGENATION CATALYST AT ABOUT 20* TO ABOUT 300*C. UNDER HYDROGEN PRESSURE OF ABOUT 50 TO ABOUT 5000 P.S.I.G., THE IMPROVEMENT, WHEREBY THE EFFECTIVE LIFE OF THE CATALYST IS EXTENDED, OF REACTING A FRESHLY PREPARED CLEAR AQUEOUS SOLUTION OF SAID ALPHA-HYDROXYALDEHYDE BEFORE FORMATION OF UNDISSOLVED POLYMER OF SAID ALDEHYDE THEREIN, WITH AN ALIPHATIC, SATURATED UNSUBSTITUTED ALCOHOL OF 1 TO 6 CARBON ATOMS PER MOLECULE TO PRODUCE THE HEMIACETAL OF SAID ALPHA-HYDROXYALDEHYDE AND SAID ALCOHOL HAVING A SOLUBILITY IN THE HYDROGENATION MIXTURE OF AT LEAST 0.1 GRAM PER 100 GRAMS OF LIQUID MIXTURE AND CARRYING OUT THE SAID HYDROGENATION WITH THE RESULTING AQUEOUS SOLUTION OF SAID HEMIACETAL.
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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |