Patent US2513090A successfully refreshed from Google Patents.
US2513090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of unsaturaied esters
Assignee: —
•
Filing: —
•
Granted: 1950-06-27
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Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:28
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
A-METHOD OF PREPARING A 1,1-DIACYLOXY2-ALKENE WHICH COMPRISES PASSING A GASEOUS STREAM COMPRISING THE VAPORS OF AN ACYLIC ALPHA BETA-OLEFINIC ADEHYDE CONTAINING NOT MORE THAN THE ONE CARBON-TO-CARBON MULTIPLE BOND AND OF A VOLATILE, ALIPHATIC, CARBOXYLIC ACID ANHYDRIDE IN SUBSTANTIALLY EQUIMOLAR PROPORTIONS INTO CONTACT WITH A SOLID CATALYST CONSISTING ESSENTIALLY OF A CALCINED MIXTURE OF A PHOSPHORIC ACID AND AN INERT SOLID, ABSORBENT MINERAL MATERIAL MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 150*C. AND ABOUT 350*C. AT A RATE OF FLOW OF FROM ABOUT 0.01 TO ABOUT 0.5 MOLES OF REACTANTS PER 100 CC. OF CATALYST PER MINUTE.
References Cited (Backward Citations)
US2393740A
Cited
US2312193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |