Patent US2550996A successfully refreshed from Google Patents.
US2550996A
Expired / Lapsed
US
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Process for the isolation of polyvinyl chloride
Assignee: Individual
•
Filing: 1948-02-27
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Granted: 1951-05-01
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Expires: 1968-02-27
Abstract
No abstract record available.
Inventors
- 👤 Halbig Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:55
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR THE ISOLATION OF POLYVINYL CHLORIDE FROM A COAGULATED AQUEOUS EMULSION THEREOF, COMPRISING THE STEPS OF INTENSIVELY STIRRING THE COAGULATED AQUEOUS EMULSION WITH A LIQUID ESSENTIALLY WATER-INSOLUBLE ORGANIC COMPOUND WHICH HAS SUBSTANTIALLY NO DISSOLVING EFFECT ON POLYVINYL CHLORIDE AT THE TEMPERATURE PRREVAILING DURING THE STIRRING, CONTINUING THE SAID STIRRING UNTIL THE POLYMER HAS ACQUIRED A DEGREE OF WATER-REPELLENCY SUCH THAT, AFTER SIMPLE CENTRIFUGING, ITS WATER CONTENT DOES NOT EXCEED MORE THAN ABOUT 20%, THEN REMOVING THE ORGANIC LIQUID FROM THE STIRRED COAGULATED EMULSION, AND FINALLY ISOLATING THE POLYMER FROM THE REMAINING AQUEOUS MIXTURE.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE ISOLATION OF POLYVINYL CHLORIDE FROM A COAGULATED AQUEOUS EMULSION THEREOF, COMPRISING THE STEPS OF INTENSIVELY STIRRING THE COAGULATED AQUEOUS EMULSION WITH A LIQUID ESSENTIALLY WATER-INSOLUBLE ORGANIC COMPOUND WHICH HAS SUBSTANTIALLY NO DISSOLVING EFFECT ON POLYVINYL CHLORIDE AT THE TEMPERATURE PRREVAILING DURING THE STIRRING, CONTINUING THE SAID STIRRING UNTIL THE POLYMER HAS ACQUIRED A DEGREE OF WATER-REPELLENCY SUCH THAT, AFTER SIMPLE CENTRIFUGING, ITS WATER CONTENT DOES NOT EXCEED MORE THAN ABOUT 20%, THEN REMOVING THE ORGANIC LIQUID FROM THE STIRRED COAGULATED EMULSION, AND FINALLY ISOLATING THE POLYMER FROM THE REMAINING AQUEOUS MIXTURE.
References Cited (Backward Citations)
US2068424A
Cited
US2458636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |