US3184431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polycarbonate resins using two-step addition of catalyst
Assignee: Honeywell International Inc
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Filing: 1960-11-25
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Granted: 1965-05-18
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Expires: 1980-11-25
Abstract
No abstract record available.
Inventors
- 👤 Rudolph D Deanin
- 👤 Jr Joseph O Berry
- 👤 Lloyd R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:48
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/22; C08G64/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE PREPARATION OF A POLYCARBONATE RESIN WHICH COMPRISES (1) ADDING PHOSGENE TO AN AQUEOUS ALKALINE SOLUTION CONTAINING A DI-MONOHYDROXARYL-ALKALINE AND AN INERT ORGANIC SOLVENT WHICH IS IMMICIBLE LIN THE AQUEOUS PHASE, (II) STIRRING THE REACTION MIXTURE, (III) RECOVERING THE RESULTING POLYCARBONATE RESIN, WHEREIN THE REACTION IS CONDUCTED IN THE PRESENCE OF A CATALYTIC AMOUNT OF QUATERNARY AMMONIUM COMPOUND AS A CATALYST, FROM 30 TO 50 PERCENT OF SAID CATALYST BEING PRESENT DURING THE PHOSGENATION REACTION, AND THE REMAINDER OF SAID CARALYST BEING ADDED AFTER COMPLETION OF THE PHOSGENATION REACTION.
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE PREPARATION OF A POLYCARBONATE RESIN WHICH COMPRISES (1) ADDING PHOSGENE TO AN AQUEOUS ALKALINE SOLUTION CONTAINING A DI-MONOHYDROXARYL-ALKALINE AND AN INERT ORGANIC SOLVENT WHICH IS IMMICIBLE LIN THE AQUEOUS PHASE, (II) STIRRING THE REACTION MIXTURE, (III) RECOVERING THE RESULTING POLYCARBONATE RESIN, WHEREIN THE REACTION IS CONDUCTED IN THE PRESENCE OF A CATALYTIC AMOUNT OF QUATERNARY AMMONIUM COMPOUND AS A CATALYST, FROM 30 TO 50 PERCENT OF SAID CATALYST BEING PRESENT DURING THE PHOSGENATION REACTION, AND THE REMAINDER OF SAID CARALYST BEING ADDED AFTER COMPLETION OF THE PHOSGENATION REACTION.
References Cited (Backward Citations)
US2970131A
Cited
US2964794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-17 | 1968-11-16 | 1969-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-17 | 1972-11-16 | 1973-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-17 | 1976-11-16 | 1977-05-18 | $7700.00 | Window Closed / Lapsed |