Patent US3213059A successfully refreshed from Google Patents.
US3213059A
Expired / Lapsed
US
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Process for preparation of polycarbonate resins
Assignee: Honeywell International Inc
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Filing: 1960-12-29
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Granted: 1965-10-19
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Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 Rudolph D Deanin
- 👤 Roessel Polly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:21
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/22; C08G64/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR THE PREPARATION OF A POLYCARBONATE RESIN WHICH COMPRISES (I) PREPARING AN AQUEOUS ALKALINE SOLUTION CONTAINING A DI-MONOHYDROXYARYL-ALKANE AND AN INERT ORGANIC SOLVENT IMMISCIBLE WITH THE AQUEOUS PHASE, (II) ADDING PHOSGENE THERETO IN TWO PORTIONS, (A) THE FIRST PORTION CONTAINING FROM ABOUT 66 2/3 TO 91 2/3 PERCENT OF THE TOTAL AMOUNT OF PHOSGENE AND BEING ADDED AT A RATE FRO ABOUT 0.5 TO 1.2 MOLS PHOSGENE PER HOUR PER MOL DI-MONOHYDROXYARYL-ALKANE; (B) THE SECOND PORTION CONTAINING FROM ABOUT 8 1/3 TO 33 1/3 PERCENT OF THE TOTAL AMOUNT OF PHOSGENE AND BEING ADDED AT A RATE OF FROM ABOUT 0.04 TO 0.4 MOL PHOSGENE PER HOUR PER MOL DIMONOHYDROXYARYL-ALKANE AND (III) RECOVERING THE RESULTING POLYCARBONATE RESIN.
Claim 2
Dependent Claim
119 words
A PROCESS FOR THE PREPARATION OF A POLYCARBONATE RESIN WHICH COMPRISES (I) PREPARING AN AQUEOUS ALKALINE SOLUTION CONTAINING A DI-MONOHYDROXYARYL-ALKANE AND AN INERT ORGANIC SOLVENT IMMISCIBLE WITH THE AQUEOUS PHASE, (II) ADDING PHOSGENE THERETO IN TWO PORTIONS, (A) THE FIRST PORTION CONTAINING FROM ABOUT 66 2/3 TO 91 2/3 PERCENT OF THE TOTAL AMOUNT OF PHOSGENE AND BEING ADDED AT A RATE FRO ABOUT 0.5 TO 1.2 MOLS PHOSGENE PER HOUR PER MOL DI-MONOHYDROXYARYL-ALKANE; (B) THE SECOND PORTION CONTAINING FROM ABOUT 8 1/3 TO 33 1/3 PERCENT OF THE TOTAL AMOUNT OF PHOSGENE AND BEING ADDED AT A RATE OF FROM ABOUT 0.04 TO 0.4 MOL PHOSGENE PER HOUR PER MOL DIMONOHYDROXYARYL-ALKANE AND (III) RECOVERING THE RESULTING POLYCARBONATE RESIN.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |