US2862976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification process
Assignee: Gulf Research and Development Co
•
Filing: 1953-10-14
•
Granted: 1958-12-02
•
Expires: 1973-10-14
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Dubbs
- 👤 Donald R Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:32
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE PROCESS OF PURIFYING A GEM-BIS(HYDROXYPHENYL) ALKALINE CONTAINING AS AN IMPURITY A SMALLE AMOUNT OF A COMPOUND SELECTED FROM THE GROUP COMPRISES DISSOLVING THE AND ALKYLATES PHENOL WHICH COMPRISES DISSOLVING THE GEM-BIS(HYDROXYPHENYL)ALKANE AND SAID IMPURITY IN AN ORGANIC SOLVENT, CONTACTING THE SOLUTION THUS FORMED WITH ANHYDROUS AMMONIA AT ABOUT 0*TO ABOUT 30*C. FOR A TIME SUFFICIENT TO FROM A SOLID ADDUCT BETWEEN THE GEN-BIS(HYDROXPHENYL)ALKANE AND AMMONIA, SEPARATING THE SOLID ADDUCT THUS FORMED THE REACTION MASS, AND DISSOCIATING THE SOLID ADDUCT INTO AMMONIA AND A SUBSTANTIALLY PURE GEM-BIS(HYDROXYPHENYL)ALKENE.
Claim 2
Dependent Claim
87 words
THE PROCESS OF PURIFYING A GEM-BIS(HYDROXYPHENYL) ALKALINE CONTAINING AS AN IMPURITY A SMALLE AMOUNT OF A COMPOUND SELECTED FROM THE GROUP COMPRISES DISSOLVING THE AND ALKYLATES PHENOL WHICH COMPRISES DISSOLVING THE GEM-BIS(HYDROXYPHENYL)ALKANE AND SAID IMPURITY IN AN ORGANIC SOLVENT, CONTACTING THE SOLUTION THUS FORMED WITH ANHYDROUS AMMONIA AT ABOUT 0*TO ABOUT 30*C. FOR A TIME SUFFICIENT TO FROM A SOLID ADDUCT BETWEEN THE GEN-BIS(HYDROXPHENYL)ALKANE AND AMMONIA, SEPARATING THE SOLID ADDUCT THUS FORMED THE REACTION MASS, AND DISSOCIATING THE SOLID ADDUCT INTO AMMONIA AND A SUBSTANTIALLY PURE GEM-BIS(HYDROXYPHENYL)ALKENE.
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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |