Patent US2841574A successfully refreshed from Google Patents.
US2841574A
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Anionic polymerization process
Assignee: Ethyl Corp
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Filing: 1954-02-01
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Granted: 1958-07-01
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Expires: 1974-02-01
Abstract
No abstract record available.
Inventors
- 👤 Walter E Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:05
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/06; C08F4/12; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS WHICH COMPRISES POLYMERIZING AN ETHYLENIC MONOMER IN THE PRESENCE OF A CATALYST CONSISTING OF A SODIUM ALKENYL DERIVED FROM AN ALIPHATIC OLEFIN, A SODIUM ALKOXIDE DERIVED FROM METHYL ALKYL CARBINOLS, AND AN ALKALI HALIDE, SAID POLYMERIZATION BEING CONDUCTED IN THE PRESENCE OF A SOLVENT INERT TO POLYMERIZATION SELECTED FROM THE GROUP CONSISTING OF ETHERS, ACETALS, AND TERTIARY AMINES, SAID SOLVENT BEING PRESENT IN AT LEAST EQUAL MOLECULAR QUANTITIES, RELATIVE TO THE QUANTITY OF SAID CATALYST.
Claim 2
Dependent Claim
77 words
A PROCESS WHICH COMPRISES POLYMERIZING AN ETHYLENIC MONOMER IN THE PRESENCE OF A CATALYST CONSISTING OF A SODIUM ALKENYL DERIVED FROM AN ALIPHATIC OLEFIN, A SODIUM ALKOXIDE DERIVED FROM METHYL ALKYL CARBINOLS, AND AN ALKALI HALIDE, SAID POLYMERIZATION BEING CONDUCTED IN THE PRESENCE OF A SOLVENT INERT TO POLYMERIZATION SELECTED FROM THE GROUP CONSISTING OF ETHERS, ACETALS, AND TERTIARY AMINES, SAID SOLVENT BEING PRESENT IN AT LEAST EQUAL MOLECULAR QUANTITIES, RELATIVE TO THE QUANTITY OF SAID CATALYST.
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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |