US3031491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of esters of dicarboxylic acids
Assignee: Distillers Co Yeast Ltd
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Filing: 1957-12-03
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Granted: 1962-04-24
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Expires: 1977-12-03
Abstract
No abstract record available.
Inventors
- 👤 Dobson Kenneth Rowland
- 👤 Bailcy Hubert Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:50
CPC Classifications
C; C10; C10M; C10M3/00; C07; C07C; C07C67/00; C07C67/48; C07C67/60; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR PURIFYING A DIESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, PIMELIC ACID, SEBACIC ACID, OXALIC ACID AND TARTARIC ACID, WITH A SATURATED PRIMARY LOWER ALIPHATIC ALCOHOL OF AT LEAST 4 CARBON ATOMS WHICH COMPRISES CONTACTING THE ESTER WITH OZONE AT A TEMPERATURE IN THE RANGE FROM 10*C. TO 100*C., AND THEREAFTER CONTACTING THE ESTER WITH A REDUCING AGENT AT A TEMPERATURE IN THE RANGE FROM 20*C. TO 100*C.
Claim 2
Dependent Claim
75 words
A PROCESS FOR PURIFYING A DIESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, PIMELIC ACID, SEBACIC ACID, OXALIC ACID AND TARTARIC ACID, WITH A SATURATED PRIMARY LOWER ALIPHATIC ALCOHOL OF AT LEAST 4 CARBON ATOMS WHICH COMPRISES CONTACTING THE ESTER WITH OZONE AT A TEMPERATURE IN THE RANGE FROM 10*C. TO 100*C., AND THEREAFTER CONTACTING THE ESTER WITH A REDUCING AGENT AT A TEMPERATURE IN THE RANGE FROM 20*C. TO 100*C.
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) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |