US2504732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of meta-dioxanes
Assignee: Standard Oil Development Co
•
Filing: 1948-05-05
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Granted: 1950-04-18
•
Expires: 1968-05-05
Abstract
No abstract record available.
Inventors
- 👤 Rosen Raphael
- 👤 Arundale Erving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:25
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/04; C07D319/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
THE PROCESS WHICH COMPRISES CONDENSING FORMALDEHYDE WITH PROPYLENE IN THE RATIO OF 1.5 MOLS OF FORMALDEHYDE PER MOL OF PROPYLENE AT 65-66*C. UNDER A PRESSURE AT LEAST EQUAL TO THE VAPOR PRESSURE OF THE REACTION MIXTURE IN THE PRESENCE OF AN AQUEOUS BORON FLUORIDE CATALYST IN WHICH THE RATIO OF WATER TO BORON FLUORIDE CATALYST IS BETWEEN 10 TO 11 MOLS OF WATER PER MOL OF BORON FLUORIDE, NEUTRALIZING THE REACTION MASS WITH ALKALI, STEAM DISTILLING THE NEUTRALIZED MASS, DRYING THE ORGANIC PORTION OF THE STEAM DISTILLATE, AND FRACTIONATING THE DRIED MATERIAL IN ORDER TO ISOLATE 4-METHYL META-DIOXANE.
References Cited (Backward Citations)
US2158031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |