Patent US3113138A successfully refreshed from Google Patents.
US3113138A
Expired / Lapsed
US
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Preparation of butyrolactone
Assignee: FMC Corp
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Filing: 1961-12-20
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Granted: 1963-12-03
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Expires: 1981-12-20
Abstract
No abstract record available.
Inventors
- 👤 Borivoj R Franko-Filipasic
- 👤 John M Kolyer
- 👤 Jr Robert E Burks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:29
CPC Classifications
C; C07; C07D; C07D315/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE IMPROVED METHOD OF PREPARING BUTYROLACTONE WHICH COMPRISES HYDROGENATING SUCCINIC ANHYDRIDE IN THE LIQUID PHASE IN THE PRESENCE OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL ACETATES AND DIOXANE, AND A CATALYST COMPRISING PALLADIUM DEPOSITED ON A CARRIER SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CARBON AND ACTIVATED ALUMINA, AT A PRESSURE OF AT LEAST 200 P.S.I.G., WHILE MAINTAINING THE TEMPERATURE IN THE RANGE OF 3095*C. UNTIL AT LEAST A MAJOR PORTION OF THE REACTION HAS TAKEN PLACE.
Claim 2
Dependent Claim
81 words
THE IMPROVED METHOD OF PREPARING BUTYROLACTONE WHICH COMPRISES HYDROGENATING SUCCINIC ANHYDRIDE IN THE LIQUID PHASE IN THE PRESENCE OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL ACETATES AND DIOXANE, AND A CATALYST COMPRISING PALLADIUM DEPOSITED ON A CARRIER SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CARBON AND ACTIVATED ALUMINA, AT A PRESSURE OF AT LEAST 200 P.S.I.G., WHILE MAINTAINING THE TEMPERATURE IN THE RANGE OF 3095*C. UNTIL AT LEAST A MAJOR PORTION OF THE REACTION HAS TAKEN PLACE.
References Cited (Backward Citations)
US2072861A
Cited
US2867628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |