Patent EP0106400A1 successfully refreshed from Google Patents.
US2576901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of delta-valero-lactones
Assignee: Shell Development Co
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Filing: 1950-10-16
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Granted: 1951-11-27
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Expires: 1970-10-16
Abstract
No abstract record available.
Inventors
- 👤 Jong Henry W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:23
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/16; C07D309/28; C07D309/30; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A PROCESS FOR THE PRODUCTION OF A SUBSTITUTED DELTA-VALEROLACTONE, SAID PROCESS COMPRISING CONDENSING AN ALPHA-METHYLENE ALDEHYDE CONTAINING AT LEAST FOUR CARBON ATOMS AND AN ALCOHOL IN THE PRESENCE OF A BASIC CONDENSATION CATALYST AND DISTILLING THE CONDENSATE IN THE PRESENCE OF A BASIC CONDENSATION CATALYST AT A DISTILLAND TEMPERATURE ABOVE ABOUT 70* C.
Claim 2
Dependent Claim
53 words
A PROCESS FOR THE PRODUCTION OF A SUBSTITUTED DELTA-VALEROLACTONE, SAID PROCESS COMPRISING CONDENSING AN ALPHA-METHYLENE ALDEHYDE CONTAINING AT LEAST FOUR CARBON ATOMS AND AN ALCOHOL IN THE PRESENCE OF A BASIC CONDENSATION CATALYST AND DISTILLING THE CONDENSATE IN THE PRESENCE OF A BASIC CONDENSATION CATALYST AT A DISTILLAND TEMPERATURE ABOVE ABOUT 70* C.
References Cited (Backward Citations)
US2401776A
Cited
US2526702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |