US2980703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 2-bis-(hydroxymethyl)-3, 4-dihydropyran and derivatives thereof and processes fortheir preparation
Assignee: Quaker Oats Co
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Filing: 1959-03-30
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Granted: 1961-04-18
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Expires: 1979-03-30
Abstract
No abstract record available.
Inventors
- 👤 Andrew P Dunlop
- 👤 Daniel S P Eftax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:46
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/08; C07D309/00; C07D309/02; C07D309/04; C07D309/06; C07D309/16; C07D309/20; C07D309/22; C07D309/24; C08; C08G; C08G63/00; C08G63/66; C08G63/668
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
2,2-BIS(HYDROXYMETHYL)-3,4-DIHYDROPYRAN.
Claim 2
Dependent Claim
1 words
2,2-BIS(HYDROXYMETHYL)-3,4-DIHYDROPYRAN.
Claim 3
Dependent Claim
126 words
A PROCESS FOR THE PREPARATION OF 2,2-BIS(HYDROXYMETHYL)-3,4 - DIHYDROPYRAN WHICH COMPRISES ADDING 2FORMYL-3,4-DIHYDRO(2H)PYRAN TO A MIXTURE COMPRISING AN AQUEOUS FORMALDEHYDE SOLUTION CONTAINING ABOUT 5% TO ABOUT 40% BY WEIGHT OF FORMALDEHYDE AND AN ALKALINE CONDENSING AGENT WHILE MAINTAINIG SAID MIXTURE COMPRISING AN TEMPERATURE RANGING BETWEEN ABOUT 10*C. AND ABOUT 60 C., THE MOLAR RATIO OF FORMALDEHYDE TO 2-FORMYL-3,4-DIHYDRO-(2H)-PYRAN BEING AT LEAST ABOUT 2:1 AND THE AMOUNT OF SAID CONDENSING AGENT BEING SUFFICIENT TO PROVIDE AT LEAST ABOUT ONE EQUIVALENT WEIGHT OF ALKALINE AGENT PER MOLE OF 2-FORMYL-3,4-DIHYDRO(2H)PYRAN, CONCENTRATING THE BASIC REACTION MIXTURE, DILUTING THE CONCENTRATE THUS OBTAINED WITH A SATURATED LOW-BOILING ALIPHATIC ALCOHOL, SEPARATING THE RESULTING SOLID PHASE FROM THE LIQUID PHASE, AND RECOVERING THE DESIRED PRODUCT FROM SAID LIQUID PHASE BY FRACTIONAL DISTILLATION. 5. 2,2-BIS(HYDROXYMETHYL)TETRAHYDROPYRAN.
Claim 4
Dependent Claim
126 words
A PROCESS FOR THE PREPARATION OF 2,2-BIS(HYDROXYMETHYL)-3,4 - DIHYDROPYRAN WHICH COMPRISES ADDING 2FORMYL-3,4-DIHYDRO(2H)PYRAN TO A MIXTURE COMPRISING AN AQUEOUS FORMALDEHYDE SOLUTION CONTAINING ABOUT 5% TO ABOUT 40% BY WEIGHT OF FORMALDEHYDE AND AN ALKALINE CONDENSING AGENT WHILE MAINTAINIG SAID MIXTURE COMPRISING AN TEMPERATURE RANGING BETWEEN ABOUT 10*C. AND ABOUT 60 C., THE MOLAR RATIO OF FORMALDEHYDE TO 2-FORMYL-3,4-DIHYDRO-(2H)-PYRAN BEING AT LEAST ABOUT 2:1 AND THE AMOUNT OF SAID CONDENSING AGENT BEING SUFFICIENT TO PROVIDE AT LEAST ABOUT ONE EQUIVALENT WEIGHT OF ALKALINE AGENT PER MOLE OF 2-FORMYL-3,4-DIHYDRO(2H)PYRAN, CONCENTRATING THE BASIC REACTION MIXTURE, DILUTING THE CONCENTRATE THUS OBTAINED WITH A SATURATED LOW-BOILING ALIPHATIC ALCOHOL, SEPARATING THE RESULTING SOLID PHASE FROM THE LIQUID PHASE, AND RECOVERING THE DESIRED PRODUCT FROM SAID LIQUID PHASE BY FRACTIONAL DISTILLATION. 5. 2,2-BIS(HYDROXYMETHYL)TETRAHYDROPYRAN.
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |