Patent US2979534A successfully refreshed from Google Patents.
US2979534A
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Novel process for preparing substituted dihydric indane derivatives
Assignee: Wyeth Holdings LLC
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Filing: 1957-04-15
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Granted: 1961-04-11
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Expires: 1977-04-15
Abstract
No abstract record available.
Inventors
- 👤 John C Petropoulos
- 👤 Frank A V Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:43
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C2602/00; C07C2602/02; C07C2602/04; C07C2602/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A METHOD OF PRODUCING A 1-(HYDROXYPHENYL)-INDANOL WHICH COMPRISES SIMULTANEOUSLY CRACKING AND DIMERZING IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT AND AT TEMPERATURES OF FROM ABOUT 130*C. TO 160*C. AN ALKYLIDENEBISPHENOL REPRESENTED BY THE STRUCTURE:
Claim 2
Independent Claim
35 words
A METHOD OF PRODUCING A 1-(HYDROXYPHENYL)-INDANOL WHICH COMPRISES SIMULTANEOUSLY CRACKING AND DIMERZING IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT AND AT TEMPERATURES OF FROM ABOUT 130*C. TO 160*C. AN ALKYLIDENEBISPHENOL REPRESENTED BY THE STRUCTURE:
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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |