Patent US3155685A successfully refreshed from Google Patents.
US3155685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ester lactones
Assignee: Monsanto Co
•
Filing: 1960-01-04
•
Granted: 1964-11-03
•
Expires: 1980-01-04
Abstract
No abstract record available.
Inventors
- 👤 Erhard J Prill
- 👤 James C Wygant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:27
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33; C07D309/00; C07D309/16; C07D309/28; C07D309/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD OF PRODUCING AN ESTER LACTONE, WHEREIN THE LACTONE HAS FROM 3 TO 4 CARBON ATOMS IN THE LACTONE RING IN ADDITION TO THE GROUP -CO-O-; COMPRISING THE REACTION OF ABOUT 1 MOLE OF A 2-ALKENYLSUCCINIC ANHYDRIDE, FREE FROM NON-BENZENOID UNSATURATION APART FROM THE 2-ALKENYL GROUP, WITH ABOUT 1 MOLE OF A MONOHYDRIC ALCOHOL CONTAINING LESS THAN 18 CARBON ATOMS, SAID ALCOHOL CONSISTING SOLELY OF CARBON, HYDROBEN, AND OXYGEN ATOMS, TO EFFECT THE ESTERIFICATION OF ONE CARBOXYL GROUP OF THE ANHYDRIDE, THEN EFFECTING THE FORMATION OF AN INTRAMOLECULAR ESTER BY THE REACTION OF THE SECOND CARBOXYL GROUP WITH THE UNSATURATED 2-ALKENYL GROUP IN THE PRESENCE OF FROM ABOUT 0.1 TO ABOUT 5 WEIGHT PERCENT, BASED ON THE ANHYDRIDE REACTANT, OF AN ACID CATALYTS AT A TEMPERATURE FROM ABOUT ROOM TEMPERATURE TO ABOUT 150*C. TO FORM THE ESTER LACTONE PRODUCT.
Claim 2
Independent Claim
140 words
THE METHOD OF PRODUCING AN ESTER LACTONE, WHEREIN THE LACTONE HAS FROM 3 TO 4 CARBON ATOMS IN THE LACTONE RING IN ADDITION TO THE GROUP -CO-O-; COMPRISING THE REACTION OF ABOUT 1 MOLE OF A 2-ALKENYLSUCCINIC ANHYDRIDE, FREE FROM NON-BENZENOID UNSATURATION APART FROM THE 2-ALKENYL GROUP, WITH ABOUT 1 MOLE OF A MONOHYDRIC ALCOHOL CONTAINING LESS THAN 18 CARBON ATOMS, SAID ALCOHOL CONSISTING SOLELY OF CARBON, HYDROBEN, AND OXYGEN ATOMS, TO EFFECT THE ESTERIFICATION OF ONE CARBOXYL GROUP OF THE ANHYDRIDE, THEN EFFECTING THE FORMATION OF AN INTRAMOLECULAR ESTER BY THE REACTION OF THE SECOND CARBOXYL GROUP WITH THE UNSATURATED 2-ALKENYL GROUP IN THE PRESENCE OF FROM ABOUT 0.1 TO ABOUT 5 WEIGHT PERCENT, BASED ON THE ANHYDRIDE REACTANT, OF AN ACID CATALYTS AT A TEMPERATURE FROM ABOUT ROOM TEMPERATURE TO ABOUT 150*C. TO FORM THE ESTER LACTONE PRODUCT.
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) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |