Patent US2829175A successfully refreshed from Google Patents.
US2829175A
Expired / Lapsed
US
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Purification of bis-phenols
Assignee: Gulf Research and Development Co
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Filing: 1953-10-14
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Granted: 1958-04-01
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Expires: 1973-10-14
Abstract
No abstract record available.
Inventors
- 👤 Robert S Bowman
- 👤 Arthur C Dubbs
- 👤 John F Hedenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:25
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/182; C10L1/183; C10L1/1835; C07; C07C; C07C37/00; C07C37/68; C07C37/86; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035; Y; Y10; Y10S; Y10S524/00; Y10S524/925; Y10S524/929
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE PROCESS OF PURIFYING 1,1-BIS(2-HYDROXY-3-BUTYL5-METHLPHENYL)ETHANE CONTAINING AS AN IMPURITY A SMALL AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHENOL AND ALKYLATED PHENOL WHICH COMPRISES DISSOLVING THE 1,1-BIS(2-HYDROXY-3-T-BUTYL-5-METHYLPHENYL)ETHANE AND SAID IMPURITY IN NAPHTHA; CONTACTING THE SOLUTION THUS FORMED WITH PYRIDINE AT ABOUT 0* TO ABOUT 30*C. FOR A TIME SUFFICIENT TO FORM A SOLID ADDUCT BETWEEN THE 1,1-BIS(2-HYDROXY-3-T-BUTYL-5-METHYLPHENYL)ETHANE AND PYRIDINE; SEPARATING THE SOLID ADDUCT THUS FORMED; AND DISSOCIATING THE SOLID ADDUCT INTO PYRIDINE AND SUBSTANTIALLY PURE 1,1-BIS(2-HYDROXY-3-T-BUTYL-5METHYLPHENYL)ETHANE.
Claim 2
Dependent Claim
79 words
THE PROCESS OF PURIFYING 1,1-BIS(2-HYDROXY-3-BUTYL5-METHLPHENYL)ETHANE CONTAINING AS AN IMPURITY A SMALL AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHENOL AND ALKYLATED PHENOL WHICH COMPRISES DISSOLVING THE 1,1-BIS(2-HYDROXY-3-T-BUTYL-5-METHYLPHENYL)ETHANE AND SAID IMPURITY IN NAPHTHA; CONTACTING THE SOLUTION THUS FORMED WITH PYRIDINE AT ABOUT 0* TO ABOUT 30*C. FOR A TIME SUFFICIENT TO FORM A SOLID ADDUCT BETWEEN THE 1,1-BIS(2-HYDROXY-3-T-BUTYL-5-METHYLPHENYL)ETHANE AND PYRIDINE; SEPARATING THE SOLID ADDUCT THUS FORMED; AND DISSOCIATING THE SOLID ADDUCT INTO PYRIDINE AND SUBSTANTIALLY PURE 1,1-BIS(2-HYDROXY-3-T-BUTYL-5METHYLPHENYL)ETHANE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |