Patent BE745490A successfully refreshed from Google Patents.
US2600166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of organic acids
Assignee: Cities Service Oil Co
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Filing: 1949-02-09
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Granted: 1952-06-10
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Expires: 1969-02-09
Abstract
No abstract record available.
Inventors
- 👤 William B Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:23
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
THE PROCESS OF REFINING CARBOXYLIC ACIDS INCLUDING TREATING A CARBONYL-CONTAINING MIXTURE OF CARBOXYLIC ACIDS INCLUDING ACETIC ACID, WITH A REAGENT SELECTED FROM THE GROUP CONSISTING OF RED LEAD AND LEAD TETRAACETATE, FRACTIONATING THE REACTION MIXTURE AND RECOVERING SUBSTANTIALLY PURE ACIDS.
References Cited (Backward Citations)
US2255421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-10 | 1955-12-10 | 1956-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-10 | 1959-12-10 | 1960-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-10 | 1963-12-10 | 1964-06-10 | $7700.00 | Window Closed / Lapsed |