US2669588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of bis (hydroxyaryl) substituted compounds
Assignee: Shell Development Co
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Filing: 1951-10-17
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Granted: 1954-02-16
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Expires: 1971-10-17
Abstract
No abstract record available.
Inventors
- 👤 Philip H Deming
- 👤 Dannenberg Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:25
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE PROCESS FOR THE PRODUCTION OF 2,2-DI(4HYDROXYPHENYL) PROPANE WHICH COMPRISES INTRODUCING A,A-DIMETHYLBENZYL HYDROPEROXIDE IN CONTROLLED AMOUNTS INTO AN ADMIXTURE CONSISTING ESSENTIALLY OF PHENOL AND A STRONG MINERAL ACID AT A TEMPERATURE IN THE RANGE OF FROM ABOUT -20* C. TO ABOUT +35* C. TO OBTAIN A MIXTURE WHEREIN THE MOLE RATIO OF PHENOL TO A,A-DIMETHYLBENZYL HYDROPEROXIDE IS AT LEAST 1, MAINTAINING SAID MIXTURE AT A TEMPERATURE OF FROM ABOUT 0* C. TO ABOUT 150* C., THEREBY EFFECTING THE REACTION OF A A,A-DIMETHYLBENZYL HYDROPEROXIDE WITH PHENOL WITH THE FORMATION OF REACTION PRODUCTS COMPRISING 2,2DI(4-HYDROXYPHENYL) PROPANE AND SEPARATING 2,2DI(4-HYDROXYPHENYL) PROPANE FROM SAID REACTION PRODUCTS.
Claim 2
Dependent Claim
102 words
THE PROCESS FOR THE PRODUCTION OF 2,2-DI(4HYDROXYPHENYL) PROPANE WHICH COMPRISES INTRODUCING A,A-DIMETHYLBENZYL HYDROPEROXIDE IN CONTROLLED AMOUNTS INTO AN ADMIXTURE CONSISTING ESSENTIALLY OF PHENOL AND A STRONG MINERAL ACID AT A TEMPERATURE IN THE RANGE OF FROM ABOUT -20* C. TO ABOUT +35* C. TO OBTAIN A MIXTURE WHEREIN THE MOLE RATIO OF PHENOL TO A,A-DIMETHYLBENZYL HYDROPEROXIDE IS AT LEAST 1, MAINTAINING SAID MIXTURE AT A TEMPERATURE OF FROM ABOUT 0* C. TO ABOUT 150* C., THEREBY EFFECTING THE REACTION OF A A,A-DIMETHYLBENZYL HYDROPEROXIDE WITH PHENOL WITH THE FORMATION OF REACTION PRODUCTS COMPRISING 2,2DI(4-HYDROXYPHENYL) PROPANE AND SEPARATING 2,2DI(4-HYDROXYPHENYL) PROPANE FROM SAID REACTION PRODUCTS.
References Cited (Backward Citations)
US1977627A
Cited
GB629429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |