Patent US2811564A successfully refreshed from Google Patents.
US2811564A
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Preparation of terpene diphenolic compounds
Assignee: PPG Industries Inc
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Filing: 1954-10-21
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Granted: 1957-10-29
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Expires: 1974-10-21
Abstract
No abstract record available.
Inventors
- 👤 Alfred R Bader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:15
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/14; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN THE METHOD OF PREPARING A TERPENE DIPHENOLIC COMPOUND BY THE REACTION OF A CYCLIC TERPENE WITH A PHENOLIC COMPOUND IN THE PRESENCE OF A CONDENSATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CARRING OUT THE REACTION AT A TEMPERATURE BELOW ABOUT 35*C. AND IN THE PRESENCE OF POLYPHOSPHORIC ACID.
Claim 2
Dependent Claim
48 words
IN THE METHOD OF PREPARING A TERPENE DIPHENOLIC COMPOUND BY THE REACTION OF A CYCLIC TERPENE WITH A PHENOLIC COMPOUND IN THE PRESENCE OF A CONDENSATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CARRING OUT THE REACTION AT A TEMPERATURE BELOW ABOUT 35*C. AND IN THE PRESENCE OF POLYPHOSPHORIC ACID.
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) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |