Patent US2503338A successfully refreshed from Google Patents.
US2503338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precipitation of emulsions of styrene and copolymers thereof
Assignee: Celanese Corp
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Filing: 1945-09-12
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Granted: 1950-04-11
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Expires: 1965-09-12
Abstract
No abstract record available.
Inventors
- 👤 Ernest P Irany
- 👤 Anthony J Geraci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:08
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/14; C08F6/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A PROCESS FOR THE RECOVERY OF POLYMERIZED STYRENE FROM AQUEOUS EMULSIONS THEREOF EMULSIFIED WITH EMULSIFYING AGENTS OF THE GROUP CONSISTING OF WATER-SOLUBLE ALKALI METAL SALTS OF SULFONATED AND SULFATED ORGANIC COMPOUNDS, THE STEPS WHICH COMPRISE PRECIPITATING SAID POLYMERIZED STYRENE FROM SAID EMULSIONS BY ADDING SAID EMULSIONS TO AN AQUEOUS SOLUTION CONTAINING FROM 0.2 TO 10% BY WEIGHT OF AN ALKALI OF THE FIXED ALKALI GROUP AND THEN WASHING THE PRECIPITATED POLYMERIZED STYRENE TO A PH OF 8 WITH A SOLUTION OF THE SAME ALKALI.
Claim 2
Dependent Claim
85 words
IN A PROCESS FOR THE RECOVERY OF POLYMERIZED STYRENE FROM AQUEOUS EMULSIONS THEREOF EMULSIFIED WITH EMULSIFYING AGENTS OF THE GROUP CONSISTING OF WATER-SOLUBLE ALKALI METAL SALTS OF SULFONATED AND SULFATED ORGANIC COMPOUNDS, THE STEPS WHICH COMPRISE PRECIPITATING SAID POLYMERIZED STYRENE FROM SAID EMULSIONS BY ADDING SAID EMULSIONS TO AN AQUEOUS SOLUTION CONTAINING FROM 0.2 TO 10% BY WEIGHT OF AN ALKALI OF THE FIXED ALKALI GROUP AND THEN WASHING THE PRECIPITATED POLYMERIZED STYRENE TO A PH OF 8 WITH A SOLUTION OF THE SAME ALKALI.
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) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |