US2861923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aliphatic acids
Assignee: Distillers Co Yeast Ltd
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Filing: 1954-06-16
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Granted: 1958-11-25
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Expires: 1974-06-16
Abstract
No abstract record available.
Inventors
- 👤 Eice Alec
- 👤 Graham Archibald Robert
- 👤 Millidge Alfred Frank
- 👤 Miles Ian Kenneth
- 👤 Young Donald Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:16
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR THE RECOVERY OF ACETIC ACID FROM THE PRODUCT OF THE LIQUID PHASE OXIDATION OF ALIPHATIC HYDROCARBONS CONTAINING (A) LIGHT ENDS, (B) WATER, (C) ALIPHATIC MONO-CARBOXYLIC ACIDS OF 1-4 CARBON ATOMS AND (D) HIGHER BOILING RESIDUES, WHICH COMPRISES DISTILLING THE PRODUCT PRIOR TO DEHYDRATION TO REMOVE SAID LIGHT ENDS, DISTILLING THE BASE PRODUCT OF THIS FRACTIONATION TO SEPARATE FROM THE HIGHER BOILING RESIDUES A DISTILLATE MIXTURE CONTAINING WATER AND THE ALIPHATIC MONO-CARBOXYLIC ACIDS OF 1-4 CARBON ATOMS CONTAINING COLORED CONTAMINANT INCLUDING KETONIC AND ESTER COMPOUNDS DESIGNATED AS SUBSIDIARY LIGHT ENDS, DISTILLING SAID MIXTURE TO REMOVE AS DISTILLATE SAID SUBSIDIARY LIGHT ENDS, AND THEREAFTER FRACTIONALLY DISTILLING THE BASE PRODUCT TO RECOVER THE ACETIC ACID SUBSTANTIALLY FREE FROM SAID SUBSIDIARY LIGHT ENDS.
Claim 2
Dependent Claim
122 words
A PROCESS FOR THE RECOVERY OF ACETIC ACID FROM THE PRODUCT OF THE LIQUID PHASE OXIDATION OF ALIPHATIC HYDROCARBONS CONTAINING (A) LIGHT ENDS, (B) WATER, (C) ALIPHATIC MONO-CARBOXYLIC ACIDS OF 1-4 CARBON ATOMS AND (D) HIGHER BOILING RESIDUES, WHICH COMPRISES DISTILLING THE PRODUCT PRIOR TO DEHYDRATION TO REMOVE SAID LIGHT ENDS, DISTILLING THE BASE PRODUCT OF THIS FRACTIONATION TO SEPARATE FROM THE HIGHER BOILING RESIDUES A DISTILLATE MIXTURE CONTAINING WATER AND THE ALIPHATIC MONO-CARBOXYLIC ACIDS OF 1-4 CARBON ATOMS CONTAINING COLORED CONTAMINANT INCLUDING KETONIC AND ESTER COMPOUNDS DESIGNATED AS SUBSIDIARY LIGHT ENDS, DISTILLING SAID MIXTURE TO REMOVE AS DISTILLATE SAID SUBSIDIARY LIGHT ENDS, AND THEREAFTER FRACTIONALLY DISTILLING THE BASE PRODUCT TO RECOVER THE ACETIC ACID SUBSTANTIALLY FREE FROM SAID SUBSIDIARY LIGHT ENDS.
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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |