US2606936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of phenolic acids
Assignee: Koch Industries Inc
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Filing: 1950-11-29
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Granted: 1952-08-12
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Expires: 1970-11-29
Abstract
No abstract record available.
Inventors
- 👤 Vesta F Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:37
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86; C07C37/005; C07C37/006
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
PROCESS OF PURIFYING A MIXTURE CONTAINING PHENOLS CONTAMINATED WITH THIOPHENOLS, MERCAPTANS AND OTHER SULFUR COMPOUNDS AND HYDROCARBONS WHICH COMPRISES ESTERIFYING THE PHENOL CONTENT OF SAID MIXTURE WITH BORIC ACID TO PRODUCE THE BORATE ESTER OF SAID PHENOL, DISTILLING OFF SUBSTANTIALLY UNCHANGED THIOPHENOLS, MERCAPTANS AND HYDROCARBONS, HYDROLYZING THE RESIDUAL BORATE ESTERS OF PHENOLS TO LIBERATE THE PHENOL, AND RECOVERING THE LATTER.
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) | 1955-08-12 | 1956-02-11 | 1956-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-12 | 1960-02-11 | 1960-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-12 | 1964-02-11 | 1964-08-12 | $7700.00 | Window Closed / Lapsed |