US2796445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing methylene bis phenols
Assignee: Wyeth Holdings LLC
•
Filing: 1954-11-04
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Granted: 1957-06-18
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Expires: 1974-11-04
Abstract
No abstract record available.
Inventors
- 👤 Frank A V Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A METHOD OF PREPARING 2,2''-METHYLENE BIS-4,6-DIALKYL PHENOLS OF THE FORMULA
Claim 2
Independent Claim
10 words
A METHOD OF PREPARING 2,2''-METHYLENE BIS-4,6-DIALKYL PHENOLS OF 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) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |