US2858343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 2, 2-bisphenolic propane compounds
Assignee: Union Carbide Corp
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Filing: 1955-11-25
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Granted: 1958-10-28
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Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
- 👤 Raymond I Hoaglin
- 👤 Charles W Plummer
- 👤 Henry C Schultze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:17
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE PROCESS FOR THE PRODUCTION OF A 2,2-BISPHENOLIC PROPANE WHICH COMPRISES REACTING AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 25*C. TO ABOUT 80*C. A MONOHYDRIC PHENOL WHEREIN THE PARA POSITION TO THE PHENOLIC HYDROXYL GROUP HAS ONLY A SUBSTITUTABLE HYDROGEN ATOM WITH AN ISOPROPENYL ESTER OF A LOWER ALKANOIC ACID IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT PRESENT IN AN AMOUNT OF AT LEAST 0.10 MOLE PER MOLE OF SAID ISOPROPENYL ESTER.
Claim 2
Dependent Claim
74 words
THE PROCESS FOR THE PRODUCTION OF A 2,2-BISPHENOLIC PROPANE WHICH COMPRISES REACTING AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 25*C. TO ABOUT 80*C. A MONOHYDRIC PHENOL WHEREIN THE PARA POSITION TO THE PHENOLIC HYDROXYL GROUP HAS ONLY A SUBSTITUTABLE HYDROGEN ATOM WITH AN ISOPROPENYL ESTER OF A LOWER ALKANOIC ACID IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT PRESENT IN AN AMOUNT OF AT LEAST 0.10 MOLE PER MOLE OF SAID ISOPROPENYL ESTER.
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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |