US2921962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing poly-hydroxy arylophenones
Assignee: GAF Chemicals Corp
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Filing: 1958-06-20
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Granted: 1960-01-19
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Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
- 👤 Lester N Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:48
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/82; C07C49/83; C07C49/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE PROCESS OF PREPARING POLY-HYDROXY ARYLOPHENONES WHICH COMPRISES CONDENSING AN O-HYDROXY ARYLCARBOXYLIC ACID WITH A PHENOL IN THE PRESENCE OF A MIXTURE OF PHOSPHORUS TRICHLORIDE AND ZINC CHLORIDE AS A CATALYST AND IN THE PRESENCE OF PHOSPHORIC ACID WHICH HAS A PHOSPHORIC ACID CONTENT OF 100-106% AS A SOLVENT, AND AT A TEMPERATURE RANGING FROM 45-75*C., AND ISOLATING AND PURIFYING THE SAID PHENONE.
Claim 2
Dependent Claim
63 words
THE PROCESS OF PREPARING POLY-HYDROXY ARYLOPHENONES WHICH COMPRISES CONDENSING AN O-HYDROXY ARYLCARBOXYLIC ACID WITH A PHENOL IN THE PRESENCE OF A MIXTURE OF PHOSPHORUS TRICHLORIDE AND ZINC CHLORIDE AS A CATALYST AND IN THE PRESENCE OF PHOSPHORIC ACID WHICH HAS A PHOSPHORIC ACID CONTENT OF 100-106% AS A SOLVENT, AND AT A TEMPERATURE RANGING FROM 45-75*C., AND ISOLATING AND PURIFYING THE SAID PHENONE.
References Cited (Backward Citations)
US415088A
Cited
US2386007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |