US3555083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of lower fatty acids
Assignee: Tekkosha Co Ltd
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Filing: 1964-03-12
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Granted: 1971-01-12
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Expires: 1984-03-12
Abstract
Abstract A PROCESS FOR RECOVERING LOWER FATTY ACIDS, SUCH AS FORMIC ACID AND ACETIC ACID, FROM THE OXIDIZED PRODUCTS OBTAINED BY OXIDIZING, IN THE LIQUID PHASE, PARAFFINIC HYDROCARBONS, NAPHTHENIC HYDROCARBONS AND MIXTURES THEREOF, SAID HYDROCARBONS HAVING BOILING POINTS LOWER THAN 200*C., WITH MOLECULAR OXYGEN OR AN OXYGEN-CONTAINING GAS, IN WHICH THE LIGHT FRACTIONS OBTAINED FROM THE OXIDIZED PRODUCTS MADE BY THE LIQUID PHASE OXIDATION OF THE ABOVEMENTIONED HYDROCARBONS ARE RECYCLED TO THE DISTILLATION APPARATUS TO SERVE AS ENTRAINERS FOR WATER IN THE DEHYDRATING DISTILLATION OF AZEOTROPIC MIXTURES OF WATER AND LOWER FATTY ACIDS HAVING 1-4 CARBONS ATOMS.
Inventors
- 👤 Takeo Nakamura
- 👤 Hiroshi Murayama
- 👤 Tatsuya Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:24
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/46; C07C51/16; C07C51/21; C07C51/215; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |