US2497408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of propylene glycol esters
Assignee: EIDP Inc
•
Filing: 1947-11-13
•
Granted: 1950-02-14
•
Expires: 1967-11-13
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:28
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/04; C07C67/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR THE PREPARATION OF PROPYLENE GLYCOL MONOACETATE AND PROPYLENE GLYCOL DIACETATE WHICH COMPRISES ACTING ON ACETIC ACID AND PROPYLENE WITH AN OXIDIZING GAS AT A TEMPERATURE BETWEEN 100* AND 350*C., AND UNDER A PRESSURE OF AT LEAST 400 POUNDS PER SQUARE INCH IN THE PRESENCE OF A MIXED CATALYST OF AN ACETATE OF AN ALKALINE EARTH AND OF AN ACETATE OF A HEAVY METAL OF THE GROUP CONSISTING OF LEAD AND FERRIC IRON.
Claim 2
Dependent Claim
75 words
A PROCESS FOR THE PREPARATION OF PROPYLENE GLYCOL MONOACETATE AND PROPYLENE GLYCOL DIACETATE WHICH COMPRISES ACTING ON ACETIC ACID AND PROPYLENE WITH AN OXIDIZING GAS AT A TEMPERATURE BETWEEN 100* AND 350*C., AND UNDER A PRESSURE OF AT LEAST 400 POUNDS PER SQUARE INCH IN THE PRESENCE OF A MIXED CATALYST OF AN ACETATE OF AN ALKALINE EARTH AND OF AN ACETATE OF A HEAVY METAL OF THE GROUP CONSISTING OF LEAD AND FERRIC IRON.
References Cited (Backward Citations)
US2138917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |