US2798093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the separation of waterinsoluble dicarboxylic acids from their mixtures with other water-insoluble materials
Assignee: Henkel AG and Co KGaA
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Filing: 1955-04-27
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Granted: 1957-07-02
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Expires: 1975-04-27
Abstract
No abstract record available.
Inventors
- 👤 Stein Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:31
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A METHOD FOR THE SEPARATION OF NON-AROMATIC WATER INSOLUBE DI-CARBOXYLIC ACIDS FROM THEIR MIXTURES WITH OTHER WATER-INSOLUBLE MATERIALS, WHICH COMPRISES EXTRACTING THE SAID WATER-INSOLUBLE MIXTURE WITH A HOT, AQUEOUS SOLUTION OF A SALT OF A POLY-CARBOXYLIC ACID, WHICH HAS AT LEAST TWO CARBOXYL GROUPS SUBSTANTIALLY COMPLETELY NEUTRALIZED BY MONO-BASIC CATIONS, AND SEPARATING PRECIPITATED NON-AROMATIC DI-CARBOXYLIC ACID FROM THE EXTRACTING SOLUTION.
Claim 2
Independent Claim
60 words
A METHOD FOR THE SEPARATION OF NON-AROMATIC WATER INSOLUBE DI-CARBOXYLIC ACIDS FROM THEIR MIXTURES WITH OTHER WATER-INSOLUBLE MATERIALS, WHICH COMPRISES EXTRACTING THE SAID WATER-INSOLUBLE MIXTURE WITH A HOT, AQUEOUS SOLUTION OF A SALT OF A POLY-CARBOXYLIC ACID, WHICH HAS AT LEAST TWO CARBOXYL GROUPS SUBSTANTIALLY COMPLETELY NEUTRALIZED BY MONO-BASIC CATIONS, AND SEPARATING PRECIPITATED NON-AROMATIC DI-CARBOXYLIC ACID FROM THE EXTRACTING SOLUTION.
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) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |