US2807653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of bis-phenols
Assignee: Ethyl Corp
•
Filing: 1955-09-23
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Granted: 1957-09-24
•
Expires: 1975-09-23
Abstract
No abstract record available.
Inventors
- 👤 Allen H Filbey
- 👤 Thomas H Coffield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:03
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
PROCESS OF PREPARING DI-(3,5-DIALKYL-HYDROXYPHENYL) METHANES WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN ABOUT 20 AND ABOUT 100*C. A XLALKYL PHENOL HAVING THE FORMULA:
Claim 2
Dependent Claim
23 words
PROCESS OF PREPARING DI-(3,5-DIALKYL-HYDROXYPHENYL) METHANES WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN ABOUT 20 AND ABOUT 100*C. A XLALKYL PHENOL HAVING THE FORMULA:
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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |