US3349070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulk polymerization process
Assignee: Shell USA Inc
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Filing: 1963-04-22
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Granted: 1967-10-24
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Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 David S Thayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:47
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN THE BULK POLYMERIZATION OF A FEED CONSITING ESSENTIALLY OF STRENE IN A REACTION SYSTEM COMPRISING A POLYMERIZATION ZONE IN WHICH THE REACTION MIXTURE IS COOLED BY EVAPORATIVE COOLING AND FROM WHICH A VAPOR STREAM CONSISTING ESSENTIALLY OF STYRENE IS WITHDRAWN AT A TEMPERATURE OF AT LEAST ABOUT 280*F., THE STEPS OF COMBINING SAID VAPOR STREAM WITH A LIQUID CONDENSATE HAVING THE SOME COMPOSITION AS SAID VAPOR STREAM, IN SUFFICIENT AMOUNT TO PROVIDE A LIQUID-VAPOR MIXTURE HAVING A TEMPERATURE BELOW 200*F., PASSING SAID LIQUID-VAPOR MIXTURE THROUGH A CONDENSER WHEREIN THE MONOMER VAPORS ARE CONDENSED, RETURNING PART OF THE RESULTING CONDENSATE AS SAID LIQUID CONDENSATE TO ADMIXTURE WITH SAID VAPOR STREAM, AND RETURNING THE REMAINDER OF THE CONDENSATE TO THE REACTION MIXTURE.
Claim 2
Dependent Claim
121 words
IN THE BULK POLYMERIZATION OF A FEED CONSITING ESSENTIALLY OF STRENE IN A REACTION SYSTEM COMPRISING A POLYMERIZATION ZONE IN WHICH THE REACTION MIXTURE IS COOLED BY EVAPORATIVE COOLING AND FROM WHICH A VAPOR STREAM CONSISTING ESSENTIALLY OF STYRENE IS WITHDRAWN AT A TEMPERATURE OF AT LEAST ABOUT 280*F., THE STEPS OF COMBINING SAID VAPOR STREAM WITH A LIQUID CONDENSATE HAVING THE SOME COMPOSITION AS SAID VAPOR STREAM, IN SUFFICIENT AMOUNT TO PROVIDE A LIQUID-VAPOR MIXTURE HAVING A TEMPERATURE BELOW 200*F., PASSING SAID LIQUID-VAPOR MIXTURE THROUGH A CONDENSER WHEREIN THE MONOMER VAPORS ARE CONDENSED, RETURNING PART OF THE RESULTING CONDENSATE AS SAID LIQUID CONDENSATE TO ADMIXTURE WITH SAID VAPOR STREAM, AND RETURNING THE REMAINDER OF THE CONDENSATE TO THE REACTION MIXTURE.
References Cited (Backward Citations)
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US2989517A
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US2931793A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |