US2936267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying carboxylic acids
Assignee: FARBWERKE HOCCHST AG VORMALS M
•
Filing: 1956-11-14
•
Granted: 1960-05-10
•
Expires: 1976-11-14
Abstract
No abstract record available.
Inventors
- 👤 Fernholz Hans
- 👤 Mundlos Eberhard
- 👤 Probst Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:40
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS FOR PURIFYING A MONOCARBOXYLIC ACID CONSISTING OF A CARBOXYLIC ACID GROUP, CARBON AND HYDROGEN, CONTAINING AT LEAST 4 CARBON ATOMS AND HAVING LOW VOLATILITY, WHICH COMPRISES CO-DISTILLING SAID ACID WITH AN ENTRAINER SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS, TRIHYDRIC ALCOHOLS AND MONO-ALKYL-ETHERS THEREOF, THE ALKYL GROUP OF SAID ETHERS HAVING FROM 1 TO 3 CARBON ATOMS.
Claim 2
Dependent Claim
60 words
A PROCESS FOR PURIFYING A MONOCARBOXYLIC ACID CONSISTING OF A CARBOXYLIC ACID GROUP, CARBON AND HYDROGEN, CONTAINING AT LEAST 4 CARBON ATOMS AND HAVING LOW VOLATILITY, WHICH COMPRISES CO-DISTILLING SAID ACID WITH AN ENTRAINER SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS, TRIHYDRIC ALCOHOLS AND MONO-ALKYL-ETHERS THEREOF, THE ALKYL GROUP OF SAID ETHERS HAVING FROM 1 TO 3 CARBON ATOMS.
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) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |