US2502444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of high molecular weight elastic hydrocarbon polymers in the presence of lead tetraethyl
Assignee: Houdry Process Corp
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Filing: 1945-03-12
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Granted: 1950-04-04
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Expires: 1965-03-12
Abstract
No abstract record available.
Inventors
- 👤 Warren F Faragher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:20
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS FOR THE COPOLYMERIZATION OF A CONJUGATED DIOLEFIN SELECTED FROM THE GROUP CONSISTING OF CONJUGATED DIOLEFINS HAVING FROM FOUR TO SIX CARBON ATOMS INCLUSIVE WITH AN ARYL ALKENE SELECTED FROM THE GROUP CONSISTING OF STYRENE AND METHYL SUBSTITUTE STRYRENES TO FORM A HIGH MOLECULAR WEIGHT ELASTIC HYDROCARBON COPOLYMER OF SAID CONJUGATED DIOLEFIN AND SAID ARLY ALKENE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID COPOLYMERIZATION IN THE PRESENCE OF LEAD TETRAETHYL UNDER LIQUID PHASE CONDITIONS TO FORM A POLYMER CONTAINING MIXTURE, AND SEPARATING FROM SAID MIXTURE SAID HIGH MOLECULAR WEIGHT ELASTIC HYDROCARBON COPOLYMER OF SAID CONJUGATED DI OLEFIN AND SAID ARYL ALKENE.
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR THE COPOLYMERIZATION OF A CONJUGATED DIOLEFIN SELECTED FROM THE GROUP CONSISTING OF CONJUGATED DIOLEFINS HAVING FROM FOUR TO SIX CARBON ATOMS INCLUSIVE WITH AN ARYL ALKENE SELECTED FROM THE GROUP CONSISTING OF STYRENE AND METHYL SUBSTITUTE STRYRENES TO FORM A HIGH MOLECULAR WEIGHT ELASTIC HYDROCARBON COPOLYMER OF SAID CONJUGATED DIOLEFIN AND SAID ARLY ALKENE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID COPOLYMERIZATION IN THE PRESENCE OF LEAD TETRAETHYL UNDER LIQUID PHASE CONDITIONS TO FORM A POLYMER CONTAINING MIXTURE, AND SEPARATING FROM SAID MIXTURE SAID HIGH MOLECULAR WEIGHT ELASTIC HYDROCARBON COPOLYMER OF SAID CONJUGATED DI OLEFIN AND SAID ARYL ALKENE.
References Cited (Backward Citations)
GB191226550A
Cited
US2117022A
Cited
US2160935A
Cited
US2160939A
Cited
US2215379A
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US2376208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |